Last update 30 March 2026
Please select a location from the list below:
Closure dates marked with a dagger (†) denote when a tunnel was opened out (i.e. it stopped being a tunnel) and does not indicate line closure; the line may still be open.
| Name | Other names, remarks | Length | From | To | Opened by | Pre-group | Between… | …and |
|---|---|---|---|---|---|---|---|---|
| Gaer | 0m 403y | 1879 | open | GW | GW | Newport | Bassaleg | |
| Gaich | proposed | Unknown | Strathspey | Strathspey | Broomhill | Grantown-on-Spey | ||
| Gaisford Street (centre bore) | fast lines | 0m 52y | 1867 | open | Mid | Mid | Camden Road | Kentish Town |
| Gaisford Street (east bore) | slow lines | 0m 49y | 1867 | open | Mid | Mid | Camden Road | Kentish Town |
| Gaisford Street (west bore) | goods lines | 0m 63y | 1916 | open | Mid | Mid | Camden Road | Kentish Town |
| Gallowgate | 0m 230y | 1892 | 1987 | NB | NB | High Street | Gallowgate Central | |
| Gallows Close | see Falsgrave | |||||||
| Galton | length extended: originally 0m 65y | 0m 161y | 1867 | open | Stour | GW | Smethwick West | Smethwick Rolfe Street |
| Garnedd | closed 1946, reopened 1968 by Fest | 0m 67y | 1851 | open | Fest | Fest | Tan-y-Bwlch | Coed-y-Bleiddau |
| Garth | see Walnut Tree | |||||||
| Gasworks (centre bore) | also called Maiden Lane | 0m 528y | 1852 | open | GN | GN | Kings Cross | Finsbury Park |
| Gasworks (east bore) | also called Maiden Lane; closed 1977, reopened 2021 | 0m 528y | 1878 | open | GN | GN | Kings Cross | Finsbury Park |
| Gasworks (west bore) | also called Maiden Lane | 0m 528y | 1892 | open | GN | GN | Kings Cross | Finsbury Park |
| Gelli | 0m 164y | 1890 | 1960 | RSB | RSB | Cymmer Afan | Blaengwynfi | |
| Gelli Felin (New) | south bore: up line; also called New Clydach | 0m 386y | 1877 | 1958 | LNW | LNW | Gelli Felin | Clydach |
| Gelli Felin (Old) | north bore: down line | 0m 352y | 1862 | 1958 | MT&A | LNW | Gelli Felin | Clydach |
| George IV | 0m 238y | 1849 | open | SE | SE | Woolwich Dockyard | Woolwich Arsenal | |
| Gerrards Cross | also called Tesco | 0m 339y | 2009 | open | NR | [GW&GC] | Denham Golf Club | Gerrards Cross |
| Gildersome | 1m 571y | 1900 | 1966 | LNW | LNW | Birstal Town | Gildersome | |
| Gildersome | 0m 156y | 1857 | 1968 | LBHJ | GN | Gildersome West | Drighlington | |
| Gillingham | also called New Brompton | 0m 897y | 1858 | open | EK | LCD | Chatham | Gillingham |
| Gillingham | see Buckhorn Weston | |||||||
| Gill's Corner | 0m 96y | 1849 | 1962 | MidC | Mid | Rugby | Ullesthorpe | |
| Gipsy Hill | see Crystal Palace | |||||||
| Gisburn | also called Gisburn Hall or Gisburn Park | 0m 157y | 1880 | open | L&Y | L&Y | Gisburn | Newsholme |
| Gisburn Hall | see Gisburn | |||||||
| Gisburn Park | see Gisburn | |||||||
| Glaston | 1m 82y | 1879 | open | Mid | Mid | Harringworth | Manton | |
| Gledholt (New) | south bore | 0m 233y | by1890 | open | LNW | LNW | Huddersfield | Longwood |
| Gledholt (Old) | north bore; formerly part of Huddersfield tunnel, partly opened out for junction | 0m 243y | 1849 | open | LNW | LNW | Huddersfield | Longwood |
| Glencorse | 0m 41y | 1877 | 1959 | EL&R | NB | Roslin | Glencorse | |
| Glenfarg North | also called Pottiehill | 0m 507y | 1890 | 1970 | NB | NB | Glenfarg | Bridge of Earn |
| Glenfarg South | also called Balmanno | 0m 517y | 1890 | 1970 | NB | NB | Glenfarg | Bridge of Earn |
| Glenfield | 1m 36y | 1832 | 1966 | Leic&S | Mid | Glenfield | Leicester West Bridge | |
| Glenside | see Balchriston | |||||||
| Glyn | see Hafodyrynys | |||||||
| Goat | closed 1933, reopened 2009 by WHR | 0m 41y | 1923 | open | WH | WH | Beddgelert | Nantmor |
| Godinton Road [Chords] | twin bores; official length is 0.466km (510y) | 570m✖equivalent to 0m 623y | 2003 | open | CTRL | CTRL | Ebbsfleet International | Ashford International |
| Godinton Road 1 [main lines]✖Godinton Road 1 and 2 total combined official length, including some 'cut & cover' and open box is 1.562km (1706y) | 570m✖equivalent to 0m 623y | 2003 | open | CTRL | CTRL | Ebbsfleet International | Folkestone Channel Tunnel Terminal | |
| Godinton Road 2 [main lines]✖Godinton Road 1 and 2 total combined official length, including some 'cut & cover' and open box is 1.562km (1706y) | 422m✖equivalent to 0m 462y | 2003 | open | CTRL | CTRL | Ebbsfleet International | Folkestone Channel Tunnel Terminal | |
| Godstone | see Oxted | |||||||
| Gogginshall | also called Ballinhassig | 0m 906y | 1851 | 1961 | C&B | CBSC | Waterfall | Ballinhassig |
| Goitrecoed | ≈0m 1000y | 1841 | 1862† | TV | TV | Abercynon | Quakers Yard | |
| Golden Hill | see Pembroke Dock | |||||||
| Golgotha | closed 1987, reopened 1995 by EKR | 0m 477y | 1912 | open | EKL | EKL | Shepherdswell | Eyethorne |
| Gomersal | 0m 819y | 1900 | 1966 | LNW | LNW | Cleckheaton | Gomersal | |
| Gonerby | 0m 560y | 1850 | open | ANBE | N&G | Grantham | Sedgebrook | |
| Goonbarrow | see Stenalees | |||||||
| Gorebridge North | 0m 85y | 1848 | by 1907† | NB | NB | Gorebridge | Fushiebridge | |
| Gorebridge South | 0m 85y | 1848 | after 1940† | NB | NB | Gorebridge | Fushiebridge | |
| Goyden Pot | 0m 184y | 1921 | 1936 | NiddVL (BC) | NiddVL (BC) | Lofthouse in Nidderdale | Scar Village | |
| Graig | also called Pontypridd or Pwllgwaun or Treforest | 0m 1373y | 1889 | 1951 | BD&R | Barry | Treforest High Level | Pontypridd Graig |
| Grange Hill | also called Chigwell or Quarter Mile | 0m 260y | 1903 | open | GE | GE | Grange Hill | Chigwell |
| Granville Street | also called Five Ways | 0m 81y | 1885 | open | Mid | Mid | Birmingham New Street | Five Ways |
| Granville Street | 0m 52y | 1870 | open | Mid | Mid | Sheffield Midland | Attercliffe Road | |
| Granville Street Goods | 0m 234y | 1887 | 1967 | Mid | Mid | Granville Street | Central Goods Depot | |
| Grassendale | 0m 76y | 1864 | open | G&LC | CLC | Aigburth | Cressington | |
| Great Elm | 0m 319y | 1974 | open | ARC | BR | Frome | Whatley quarry new branch | |
| Great George Street | also called Liverpool Central | 0m 1012y | 1874 | open | CLC | CLC | St James | Liverpool Central |
| Great Horton Road | 0m 69y | 1876 | 1972 | GN | GN | Manchester Road | City Road goods branch | |
| Great Oxenden | see Oxenden | |||||||
| Great Rocks | 0m 161y | 1861 | open | Mid | Mid | Peak Forest | Miller's Dale | |
| Great Western Road | 0m 711y | 1896 | 1964 | Cal | Cal | Kelvin Bridge | Botanic Gardens | |
| Greatworth Green | twin bore; length includes portal structures | ≈2.101km | under construction | HS2 | HS2 | Birmingham Interchange | Old Oak Common | |
| Green Lane | 0m 59y | 1891 | open | Mer | Mer | Green Lane | Rock Ferry | |
| Greenbottom | 0m 134y | 1965 | open | Mid | Mid | Calverley and Rodley | Guiseley | |
| Greenfield | see Lydgate | |||||||
| Greenhithe | 0m 253y | 1849 | open | SE | SE | Greenhithe | Swanscombe | |
| Greenock | see Newton Street | |||||||
| Greenside | 0m 618y | 1893 | 1964 | GN | GN | Pudsey Greenside | Dudley Hill | |
| Greenway | also called Maypool; transferred to Dart Valley Railway 1972 | 0m 495y | 1864 | open | D&T | GW | Churston | Kingswear |
| Greenwich College | also called Maze Hill | 0m 450y | 1878 | open | SE | SE | Greenwich | Maze Hill |
| Greenwich Park No 1 | 0m 119y | 1888 | 1917 | LCD | LCD | Blackheath Hill | Greenwich Park | |
| Greenwich Park No 2 | 0m 41y | 1888 | 1917 | LCD | LCD | Blackheath Hill | Greenwich Park | |
| Greet | also called Winchcombe; closed 1976, reopened 1990 by Gloucestershire/Warwickshire Railway | 0m 693y | 1906 | open | GW | GW | Winchcombe | Gretton Halt |
| Grenofen | 0m 374y | 1859 | 1962 | SD&T | GW | Horrabridge | Whitchurch Down | |
| Gresley | 0m 623y | 1848 | open | Mid | Mid | Gresley | Moira | |
| Grimston | 0m 1305y | 1879 | open | Mid | Mid | Grimston | Old Dalby | |
| Grimston Covered Way | also called Saxelby covered way | 0m 100y | 1879 | open | Mid | Mid | Grimston | Old Dalby |
| Grimstone | see Frampton | |||||||
| Grinkle | also called Easington | 0m 992y | 1883 | open | WRMU | NE | Staithes | Grinkle |
| Grosmont | closed 1965, reopened 1973 by NYMR | 0m 144y | 1865 | open | NE | NE | Grosmont | Goathland |
| Grosmont Old | 0m 119y | 1836 | 1865 | W&P | NE | Grosmont | Goathland | |
| Grotton | see Lydgate | |||||||
| Grove | also called Madeira Park or Frant Road | 0m 183y | 1867 | 1985 | LBSC | LBSC | Tunbridge Wells | Tunbridge Wells West |
| Grove | also called Denmark Hill East; north bore | 0m 132y | 1865 | open | LBSC | LBSC | Peckham Rye | Denmark Hill |
| Grove | also called Denmark Hill East; south bore | 0m 132y | 1866 | open | LBSC | LBSC | Peckham Rye | Denmark Hill |
| Grove Hill | 0m 287y | 1851 | open | SE | SE | Tunbridge Wells | Frant | |
| Groveley | see Cofton | |||||||
| Grovesend | 0m 167y | 1872 | 1966 | Mid | Mid | Tytherington | Thornbury | |
| Guide Bridge | 0m 154y | 1882 | 1968 | LNW | LNW | Hooley Hill | Dukinfield | |
| Guildford | see Chalk | |||||||
| Gulwell | 0m 47y | 1931 | 1971 | GW | GW | Buckfastleigh | Ashburton | |
| Guston | 0m 1412y | 1881 | open | D&D | D&D | Dover Priory | Martin Mill | |
| Gwersyllt | see Summer Hill | |||||||
| Gyfylchi | also called Gyfalcha or Tonmawr or Pelena | 0m 1109y | 1863 | 1947 | SWM | SWM | Tonmawr Junction | Cymmer |
| Hackington | see Tyler Hill | |||||||
| Hackney Downs | see Queens Road | |||||||
| Haddon | 0m 1058y | 1863 | 1968 | Mid | Mid | Bakewell | Rowsley | |
| Haden Hill | 0m 151y | 1878 | 1969 | GW | GW | Old Hill | Coombes Holloway Halt | |
| Hadley Wood North | also called Enfield North or North Enfield; west bore (new) | 0m 232y | 1959 | open | BR | [GN] | Hadley Wood | Potters Bar |
| Hadley Wood North | also called Enfield North or North Enfield; east bore (old) | 0m 232y | 1850 | open | GN | GN | Hadley Wood | Potters Bar |
| Hadley Wood South | also called Enfield South or South Enfield; west bore (new) | 0m 384y | 1959 | open | BR | [GN] | New Barnet | Hadley Wood |
| Hadley Wood South | also called Enfield South or South Enfield; east bore (old) | 0m 384y | 1850 | open | GN | GN | New Barnet | Hadley Wood |
| Hafodyrynys | also called Glyn | 0m 280y | 1855 | 1964 | NA&H | GW | Pontypool | Hafodyrynys |
| Hag Wood | see Toadmoor | |||||||
| Haie Hill | see Bullo | |||||||
| Haigh | see Hall Lane | |||||||
| Halfpence Lane | 170m✖equivalent to 0m 186y | 2003 | open | CTRL | CTRL | Ebbsfleet International | Folkestone Channel Tunnel Terminal | |
| Hall Lane | also called Haigh | 0m 375y | 1869 | 1883† | LU | L&Y | Whelley | Standish |
| Halton | see Sutton | |||||||
| Haltwhistle | see Whitchester | |||||||
| Ham Green | see Pill | |||||||
| Hammer's Hill | also called Hamer's Hill or Denholme | 0m 153y | 1852 | 1963 | GN | GN | Thornton | Denholme |
| Hampstead (Marylebone) | east bore | 0m 694y | 1899 | open | GC | GC | Marylebone | Harrow-on-the-Hill |
| Hampstead (Marylebone) | west bore | never completed | GC | GC | Marylebone | Harrow-on-the-Hill | ||
| Hampstead Heath | 0m 1166y | 1860 | open | HJ | LNW | Hampstead | Finchley Road | |
| Hampstead Junction | down/south bore: goods lines | 0m 49y | 1867 | open | Mid | Mid | Kentish Town | Finchley Road |
| Hampstead Junction | centre bore: fast lines | 0m 52y | 1867 | open | Mid | Mid | Kentish Town | Finchley Road |
| Hampstead Junction | up/north bore: slow lines | 0m 76y | 1899 | 1962? | Mid | Mid | Kentish Town | Finchley Road |
| Hampstead Road | ≈0m 115y | 1837 | after 1915† | L&Bm | LNW | London Euston | Camden | |
| Hamstead | also called Handsworth Wood | 0m 125y | 1887 | open | LNW | LNW | Handsworth Road | Hamstead |
| Handsworth | see Darnall | |||||||
| Handsworth Wood | see Hamstead | |||||||
| Harbord Street | see Overbury Street | |||||||
| Harbour | see Ramsgate Harbour | |||||||
| Harbury | 0m 73y | 1852 | open | GW | GW | Southam Road & Harbury | Leamington Spa | |
| Harecastle Middle | 0m 180y | 1848 | 1966 | NS | NS | Kidsgrove Central | Chatterley | |
| Harecastle New | see Kidsgrove | |||||||
| Harecastle North | 0m 130y | 1848 | 1966† | NS | NS | Kidsgrove Central | Chatterley | |
| Harecastle South | 1m 6y | 1848 | 1966 | NS | NS | Kidsgrove Central | Chatterley | |
| Harlesden | 0m 147y | 1915 | open | LNW | LNW | Willesden Junction | Harlesden | |
| Harmer Green | see Welwyn North | |||||||
| Harrietsham | 150m✖equivalent to 0m 164y | 2003 | open | CTRL | CTRL | Ebbsfleet International | Folkestone Channel Tunnel Terminal | |
| Harrogate | also called Brunswick | ≈0m 415y | 1848 | 1862 | Y&NM | NE | Hornbeam Park | Harrogate Brunswick |
| Hartshill | also called Newcastle East | 0m 145y | 1852 | 1966 | NS | NS | Hartshill & Basford | Newcastle-under-Lyme |
| Hartshill West | see Newcastle | |||||||
| Hastings | 0m 788y | 1851 | open | SE | SE | St Leonards Warrior Square | Hastings | |
| Haslingden | also called North Hag | 0m 146y | 1848 | 1966 | ELancs | L&Y | Haslingden | Helmshore |
| Hatch | 0m 152y | 1866 | 1964 | B&E | GW | Thornfalcon | Hatch | |
| Hattersley No 1 | 0m 100y | 1842 | 1930† | SALM | GC | Hattersley | Broadbottom | |
| Hattersley No 2 | 0m 264y | 1842 | 1930† | SALM | GC | Hattersley | Broadbottom | |
| Haughhead | see Barncluith | |||||||
| Haverstock Hill | see Belsize | |||||||
| Haverthwaite East | closed 1965, reopened 1973 by Lakeside & Haverthwaite Railway | 0m 87y | 1869 | open | Fur | Fur | Haverthwaite | Newby Bridge |
| Haverthwaite West | closed 1965, reopened 1973 by Lakeside & Haverthwaite Railway | 0m 165y | 1869 | open | Fur | Fur | Greenodd | Haverthwaite |
| Haw Bank | 0m 220y | 1888 | open | Mid | Mid | Skipton | Embsay | |
| Hawkhurst | see Badger's Oak | |||||||
| Hawthorne Road | see Walton-on-the-Hill No 3 | |||||||
| Hawthorns | also called Euroclydon or Puddlebrook; built 1870s, line never opened, rails lifted 1917 | 0m 636y | GW | GW | Drybrook | Mitcheldean Road | ||
| Haydock Colliery | 0m 100y | 1895 | 1965 | LSHSL | GC | Ashton-in-Makerfield | Haydock | |
| Haydon Bridge | original location | 0m 44y | 1838 | 2009 | N&C | NE | Bardon Mill | Haydon Bridge |
| Haydon Bridge | new location to west | 0m 65y | 2009 | open | NR | [NE] | Bardon Mill | Haydon Bridge |
| Hayfield | also called New Mills (Hayfield) | 0m 198y | 1868 | 1970 | MNMH | Sh&MJ | New Mills Central | Birch Vale |
| Hay Hill | see Bullo | |||||||
| Haymarket | central compartment | 0m 139y | 1847 | 1993 | BLCJ | Birk | Rock Ferry | docks area |
| Haymarket | east compartment | 0m 139y | by 1876 | 1993 | Birk | Birk | Rock Ferry | docks area |
| Haymarket | west compartment | 0m 179y | by 1876 | 1993 | Birk | Birk | Rock Ferry | docks area |
| Haymarket (New) | south bore | 0m 1009y | by 1908 | open | NB | NB | Haymarket | Edinburgh Waverley |
| Haymarket (Old) | north bore | 0m 992y | 1847 | open | E&G | NB | Haymarket | Edinburgh Waverley |
| Hayne | also called Hayne Wood | 0m 94y | 1847 | 1951 | SE | SE | Sandling | Hythe |
| Hayne Wood | see Hayne | |||||||
| Haywards Heath | also called Folly Hill | 0m 249y | 1841 | open | Mid | L&Br | Haywards Heath | Wivelsfield |
| Headingley | 0m 70y | 1849 | open | L&T | NE | Burley Park | Headingley | |
| Headstone | also called Monsal Head | 0m 533y | 1863 | 1968 | Mid | Mid | Monsal Dale | Great Longstone |
| Healey House | 0m 30y | 1868 | 1965 | L&Y | L&Y | Healey House | Meltham | |
| Heath Hill | also called Horsehay; closed 1964, reopened 2015 by Telford Steam Railway | 0m 59y | 1857 | open | W&SJ | GW | Lawley Bank | Horsehay |
| Heathfield | 0m 265y | 1880 | 1968 | LBSC | LBSC | Mayfield | Heathfield | |
| Heathrow | 4m 191y | 1998 | open | BAA | BAA | Hayes & Harlington | Heathrow | |
| Heath Town | see Wednesfield Heath | |||||||
| Heaton Lodge | north bore | 0m 84y | 1899 | open | LNW | LNW | Bradley | Battyeford |
| Heaton Lodge | south bore | 0m 80y | 1899 | 1965 | LNW | LNW | Bradley | Battyeford |
| Heaton Park | closed 1991, reopened 1992 by GMM | 0m 713y | 1879 | open | L&Y | L&Y | Bowker Vale | Heaton Park |
| Heckmondwike Bridge Street | see Heckmondwike North | |||||||
| Heckmondwike High Street | see Heckmondwike South | |||||||
| Heckmondwike North | also called Heckmondwike Bridge Street | 0m 350y | 1900 | 1990 | LNW | LNW | Northorpe Higher | Heckmondwike |
| Heckmondwike South | also called Heckmondwike High Street | 0m 51y | 1900 | 1990 | LNW | LNW | Heckmondwike | Liversedge |
| Helm | 0m 571y | 1875 | open | Mid | Mid | Crosby Garrett | Ormside | |
| Hellaby | see M18 | |||||||
| Hemingfield | 0m 44y | 1896 | open | Mid | Mid | Elsecar | Wombwell | |
| Hendon | see Burrough's | |||||||
| Heriothill | also called Rodney Street | 0m 179y | 1842 | 1967 | EL&N | NB | Scotland Street | Trinity & Newhaven |
| Hermitage | see Inver | |||||||
| Hetton | 0m 80y | 1836 | 1963 | D&S | NE | Hetton | Murton Junction | |
| Heworth | 0m 165y | 1839 | ≈1896† | BJ | NE | Heworth | Pelaw | |
| Hibel Road | also called Macclesfield | 0m 343y | 1849 | open | LNW | LNW | Prestbury | Macclesfield Hibel Road |
| Highbury | see Canonbury | |||||||
| Higher Leigham | see Leigham | |||||||
| Highgate East | north bore | 0m 139y | 1867 | 1970 | GN | GN | Crouch End | Highgate |
| Highgate East | south bore | 0m 139y | 1867 | 1954 | GN | GN | Crouch End | Highgate |
| Highgate West | north bore | 0m 332y | 1867 | 1970 | GN | GN | Highgate | East Finchley |
| Highgate West | south bore | 0m 332y | 1867 | 1954 | GN | GN | Highgate | East Finchley |
| High Hat | see St Lawrence | |||||||
| High Meads Loop Enclosure | artificial tunnel | 0m 406y | Apr 2009 | open | NR | [GE] | Hackney Wick | Temple Mills East Junction |
| High Street | also called South Willingham or Willingham or Benniworth | 0m 557y | 1875 | 1958 | L&Linc | GN | South Willingham & Hainton | Donington-on-Bain |
| High Street | see Bridgeman Street | |||||||
| High Street | 0m 672y | 1886 | open | GC&D | NB | Glasgow Queen Street Low Level | High Street | |
| High Tor No 1 | closed 1968, reopened 1991 by Peak Rail | 0m 321y | 1849 | open | MBMMJ | Mid | Matlock Bath | Matlock |
| High Tor No 1a | closed 1968, reopened 1991 by Peak Rail | 0m 58y | 1849 | open | MBMMJ | Mid | Matlock Bath | Matlock |
| High Tor No 2 | closed 1968, reopened 1991 by Peak Rail | 0m 378y | 1849 | open | MBMMJ | Mid | Matlock Bath | Matlock |
| Higham | 0m 1531y | 1845 | open | G&R | SE | Higham | Strood | |
| Higher Town | see Highertown | |||||||
| Highertown | also called Higher Town | 0m 70y | 1863 | open | Cwall | GW | Truro | Chacewater |
| Hillfield (fast) | see Newport | |||||||
| Hillfield (slow) | see Newport | |||||||
| Hillfoot | see Stanningley | |||||||
| Hillhead | see Edlingham | |||||||
| Hillhead | 0m 46y | 1896 | 1964 | Cal | Cal | At Botanic Gardens station | ||
| Hill Top | see Swan Village | |||||||
| Hilton | see Moncrieffe | |||||||
| Hinderton Field | 0m 497y | 1886 | open | Mer | Mer | Birkenhead Central | Green Lane | |
| Hindles | 0m 32y | 1865 | open | Mid | Mid | Calverley & Rodley | Guiseley | |
| Hindlow | 0m 514y | 1892 | open | LNW | LNW | Dowlow | Hindlow | |
| Hipperholme | 0m 388y | 1850 | open | L&Y | L&Y | Hipperholme | Lightcliffe | |
| Hockley No 1 | closed 1972-1995 | 0m 136y | 1854 | open | GW | GW | Birmingham Snow Hill | Hockley |
| Hockley No 2 | closed 1972-1995 | 0m 160y | 1854 | open | GW | GW | Birmingham Snow Hill | Hockley |
| Hoe Street | also called Nags Head | 0m 71y | 1870 | open | GE | GE | Walthamstow Central | Wood Street |
| Hog Hill | see Crawleyside | |||||||
| Hog's Back | see Chalk | |||||||
| Holcombe | see Parson's | |||||||
| Holdenhurst Road | twin compartment covered way | 0m 49y | 1885 | open | LSW | LSW | Bournemouth East branch | Bournemouth Central |
| Hole Head | see Parson's | |||||||
| Hollicombe | see Livermead | |||||||
| Holliday Street | also called Five Ways | 0m 93y | 1885 | open | Mid | Mid | Birmingham New Street | Five Ways |
| Hollins Hill | 0m 45y | 1876 | open | Mid | Mid | Baildon | Esholt | |
| Holme | 0m 265y | 1841 | open | M&L | L&Y | Portsmouth | Holme | |
| Holms Grove | constructed but abandoned when line was diverted before opening; tunnel name assumed; length as planned | 0m 80y | WRMU | WRMU | Sandsend | Kettleness | ||
| Holt Lane | 0m 126y | 1849 | open | MBMMJ | Mid | Matlock Bath | Matlock | |
| Holyhead Road | 0m 57y | 1863 | 1968 | SS | LNW | Wednesbury Town | Darlaston | |
| Holytown | 0m 453y | 1834 | ≈1855† | W&Cn | Cal | Mossend | Carnbroe Iron Works | |
| Holywell | see Evershot | |||||||
| Honeypot Hill | see Kensal Green | |||||||
| Honiton | 0m 1345y | 1860 | open | LSW | LSW | Seaton Junction | Honiton | |
| Honley | 0m 42y | 1860 | open | L&Y | L&Y | Berry Brow | Honley | |
| Hook Norton | also called Swerford Park | 0m 418y | 1887 | 1958 | B&CDct | GW | Rollright Halt | Hook Norton |
| Hooley Hill | 0m 176y | 1882 | 1968 | LNW | LNW | Hooley Hill | Denton | |
| Hoppity | 0m 37y | 1900 | open | SE | SE | Tadworth | Kingswood | |
| Hopton | also called Middleton Top | 0m 113y | 1830 | 1967 | C&HP | LNW | Hopton | Longcliffe |
| Horbury | 0m 128y | 1840 | by 1903† | M&L | L&Y | Horbury & Ossett | Horbury Junction | |
| Horbury Chord | 0m 50y | 1902 | 1991 | L&Y | L&Y | Crigglestone | Horbury | |
| Horse Cove | see Phillots | |||||||
| Horsehay | see Heath Hill | |||||||
| Horsmonden | 0m 86y | 1892 | 1961 | C&PW | SE | Paddock Wood | Horsmonden | |
| Horsfall | 0m 274y | 1841 | open | M&L | L&Y | Todmorden | Eastwood | |
| Horspath | also called Littleworth or Wheatley | 0m 520y | 1864 | 1967 | Wcmbe | GW | Wheatley | Horspath |
| Hose | see Clawson | |||||||
| Hotel Curve | 0m 350y | 1863 | 1976 | GN/Met | GN/Met | Kings Cross Suburban | Farringdon | |
| Hotwells No 1 | also called Portway No 1 | 0m 73y | 1885 | 1965 | BPRP | CE | Hotwells | Hotwells Halt |
| Hotwells No 2 | also called Portway No 2 | 0m 175y | 1885 | 1965 | BPRP | CE | Hotwells | Hotwells Halt |
| Hove | also called New England | 0m 220y | 1840 | open | L&Br | LBSC | Brighton Central | Holland Road Halt |
| Huddersfield (New) | also called Springwood South bore | 0m 726y | by 1890 | open | L&Y/LNW | L&Y/LNW | Huddersfield | Longwood |
| Huddersfield (Old) | north bore, also called Springwood; originally ≈0m 1070y but partly opened out for junction | 0m 713y | 1849 | open | L&Y/LNW | L&Y/LNW | Huddersfield | Longwood |
| Hunsbury Hill | 0m 1152y | 1881 | open | LNW | LNW | Roade | Northampton | |
| Hunting Butts | closed 1976, reopened 2003 by Gloucester/Warwickshire Railway | 0m 97y | 1907 | open | GW | GW | Cheltenham Racecourse | Cheltenham High Street |
| Hunton Bridge | see Watford (New) | |||||||
| Hurst Green | see Limpsfield | |||||||
| Huskisson | also called Huskisson Canal | 0m 99y | 1880 | 1975 | CLC | CLC | Walton On The Hill | Huskisson |
| Huskisson Canal | see Huskisson | |||||||
| Hutcheon Street | also called Infirmary or Maberley Street | 0m 280y | 1867 | open | GNS | GNS | Schoolhill | Hutcheon Street |
| Huthwaite | see Thurgoland (Old) | |||||||
| Ilfracombe | see Slade | |||||||
| Infirmary | see Hutcheon Street | |||||||
| Ingarsby | also called Thurnby or Square Spinney | 0m 516y | 1882 | 1964 | GN | GN | Ingarsby | Thurnby & Scraptoft |
| Ingleston | see Cartsburn (Old) | |||||||
| Ingrow | closed 1961, reopened 1968 by Keighley & Worth Valley Railway | 0m 150y | 1867 | open | K&WV | Mid | Ingrow | Damems |
| Ingrow | 0m 46y | 1852 | 1956 | GN | GN | Cullingworth | Ingrow | |
| Instow | 0m 83y | 1855 | 1984 | BideE | LSW | Fremington | Instow | |
| Intersection | 0m 135y | 1912 | open | LNW | LNW | Stonebridge Park | Wembley Central | |
| Inver | also called Dunkeld or Hermitage | 0m 350y | 1863 | open | I&PJ | High | Dunkeld | Dalguise |
| Inverkeithing | 0m 386y | by 1908 | open | NB | FB | Dalmeny | Inverkeithing | |
| Inverkip (New) | south bore: down line | 0m 194y | 1901 | 1967 | Cal | Cal | Inverkip | Wemyss Bay |
| Inverkip (Old) | north bore: up line | 0m 187y | 1865 | open | G&WB | Cal | Inverkip | Wemyss Bay |
| Inverkip Road | 0m 42y | 1869 | 1991 | G&A | G&SW | Greenock Lynedoch | Greenock Princes Pier | |
| Inverted Arch No 43A | see Doe Park No 2 | |||||||
| Inverted Arch No 43B | see Doe Park No 3 | |||||||
| Ipswich | also called Stoke Hill | 0m 361y | 1850 | open | GE | GE | Bentley | Ipswich |
| Islip Street (centre bore) | fast lines | 0m 51y | 1867 | open | Mid | Mid | Camden Road | Kentish Town |
| Islip Street (east bore) | slow lines | 0m 60y | 1867 | open | Mid | Mid | Camden Road | Kentish Town |
| Islip Street (west bore) | goods lines | 0m 48y | 1916 | open | Mid | Mid | Camden Road | Kentish Town |
| Jack Steele | 0m 66y | by 1962 | open | Fairbourne | Fairbourne | Estuary Halt | Barmouth Ferry | |
| Jubilee Street | see Sutton Harbour | |||||||
| Katherine Street | also called St Catherine's | 0m 87y | 1846 | 1965 | ASLJ | L&Y | Ashton-under-Lyne | Stalybridge |
| Keele | 0m 321y | 1870 | 1999? | NS | NS | Keele | Madeley Road | |
| Keighley Goods | also called Parkwood Street | 0m 118y | 1884 | 1961 | GN | GN | Ingrow | Keighley goods branch |
| Keldhowe Point | constructed but abandoned when line was diverted before opening; tunnel name assumed | 0m 151y | WRMU | WRMU | Sandsend | Kettleness | ||
| Kelmarsh (New) | east bore: up line | 0m 520y | 1879 | 1984 | LNW | LNW | Lamport | Kelmarsh |
| Kelmarsh (Old) | west bore: down line | 0m 520y | 1859 | 1984 | LNW | LNW | Lamport | Kelmarsh |
| Kelsterton | 0m 166y | 1998 | open | RT | RT | Shotton | Flint | |
| Kelvindale | 0m 232y | 1896 | 1920 | Cal | Cal | Dawsholm | Temple Gasworks branch | |
| Kelvingrove | 0m 942y | 1896 | 1964 | Cal | Cal | Stobcross | Kelvin Bridge | |
| Kelvinhaugh | original tunnel | 0m 755y | 1896 | 1978 | L&D | Cal | Stobcross | Partick Central |
| Kelvinhaugh | tunnel diverted and extended | 0m 968y | 1978? | open | BR | [Cal]/BR | Stobcross | Partick Central |
| Kelvinside | 0m 220y | 1896 | 1964 | L&D | Cal | Kelvinside | Crow Road | |
| Kemble | 0m 409y | 1841 | open | C&GWU | GW | Oaksey Halt | Kemble | |
| Kemp Town | 0m 1024y | 1869 | 1971 | LBSC | LBSC | Lewes Road | Kemp Town | |
| Kennaway | also called Dawlish or Lea Mount | 0m 209y | 1846 | open | SDev | GW | Dawlish | Teignmouth |
| Kensal Green (New) | north bore | 0m 320y | 1851 | open | LNW | LNW | Queens Park | Willesden |
| Kensal Green (Old) | also called Honeypot Hill; south bore | 0m 320y | 1837 | open | L&Bm | LNW | Queens Park | Willesden |
| Kensal Green (Suburban) | north bore: up line | 0m 318y | 1915 | open | LNW | LNW | Kensal Green | Willesden |
| Kensal Green (Suburban) | south bore: down line | 0m 318y | 1915 | open | LNW | LNW | Kensal Green | Willesden |
| Kentish Town (centre bore) | fast lines | 0m 51y | 1867 | open | Mid | Mid | Kentish Town | Haverstock Hill |
| Kentish Town (east bore) | slow lines | 0m 58y | 1867 | open | Mid | Mid | Kentish Town | Haverstock Hill |
| Kentish Town (west bore) | goods lines | 0m 51y | 1916 | open | Mid | Mid | Kentish Town | Haverstock Hill |
| Kenyon | 0m 34y | 1830 | open | L&M | LNW | Kenyon Junction | Parkside | |
| Keswick Big | see Brigham Forge | |||||||
| Keswick Little | see Wescoe | |||||||
| Kettleness | 0m 308y | 1883 | 1958 | WRMU | NE | Sandsend | Kettlenesss | |
| Kidbrooke | 0m 437y | 1895 | open | Bexhth | SE | Blackheath | Kidbrooke | |
| Kidsgrove | also called Harecastle New | 0m 243y | ≈1965 | open | BR | BR | Kidsgrove Central | Longport |
| Kidsgrove | see Birchenwood | |||||||
| Kilburn | 0m 90y | 1977 | 1999 | BR | [Mid] | Coxbench | Kilburn | |
| Killiecrankie | 0m 240y | 1863 | open | I&PJ | High | Pitlochry | Killiecrankie | |
| Killurin | 0m 89y | 1872 | open | DW&W | DSE | Killurin | Wexford | |
| Kilnknowe | see Torwoodlee | |||||||
| Kilpatrick | 0m 133y | 1849 | 1961 | C&B | CBSC | Upton | Bandon | |
| Kilsby | 1m 662y | 1838 | open | L&Bm | LNW | Welton | Rugby | |
| Kimberley | see Watnall | |||||||
| Kinbuck | see Ashfield | |||||||
| Kinghorn | also called Pettycur or Cryin' Hill | 0m 235y | 1847 | open | E&N | NB | Burntisland | Kinghorn |
| Kings Cross | Midland tunnel joined to existing Metropolitan tunnel | 0m 1457y | 1868 | open | Mid | Mid | Kings Cross | Kentish Town |
| Kings Cross | Midland tunnel joined to existing Metropolitan tunnel | 0m 1694y | 1868 | open | Mid/Met | Mid/Met | Kings Cross Thameslink | Kentish Town |
| Kings Cross Approach | 0m 73y | 1868 | open | Mid | Mid | Kings Cross Thameslink | Kentish Town | |
| Kingsland | main line east-west | 0m 113y | 1850 | open | EWBJ | NL | Hackney Central | Mildmay Park |
| Kingsland High Street | original lines, now included within Dalston Lane Covered Way | 0m 96y | 1865 | 1969 | NL | NL | Dalston Junction | Mildmay Park |
| Kingsland High Street | fourth line | 0m 115y | 1868 | 1969 | NL | NL | Dalston Junction | Mildmay Park |
| King's Road | see Devonport Park | |||||||
| Kingston | 0m 107y | 1846 | open | BL&H | LBSC | Falmer | Lewes | |
| King Street | see North Shields West | |||||||
| Kingswood | also called Tadworth | 0m 310y | 1900 | open | SE | SE | Tadworth | Kingswood |
| Kingswood | also called Murthly | 0m 330y | 1856 | open | High | High | Murthly | Dunkeld |
| Kippenross | also called Dunblane | 0m 610y | 1848 | open | SCen | Cal | Bridge-of-Allan | Dunblane |
| Kirkby | 0m 198y | 1848 | open | Mid | Mid | Kirkby-in-Ashfield | Annesley | |
| Kirkdale (New) No 1 | east bore | 0m 497y | 1910 | by 1970 | L&Y | L&Y | Kirkdale | Walton Junction |
| Kirkdale (New) No 2 | east bore | 0m 210y | 1910 | by 1970 | L&Y | L&Y | Kirkdale | Walton Junction |
| Kirkdale (Old) No 1✖Kirkdale (Old) was originally a single tunnel at 1149y long which was partly opened out into parts No 1/No 2 | west bore | 0m 497y | 1848 | open | L&Y/ELancs | L&Y | Kirkdale | Walton Junction |
| Kirkdale (Old) No 2✖Kirkdale (Old) was originally a single tunnel at 1149y long which was partly opened out into parts No 1/No 2 | west bore | 0m 210y | 1848 | open | L&Y/ELancs | L&Y | Kirkdale | Walton Junction |
| Kirkhill | 0m 272y | 1904 | open | L&D | Cal | Kirkhill | Newton | |
| Kirkettle | covered way, now removed; also called Rosslyn Castle or Tin Tunnel | 0m 248y | 1872 | 1967 | Pcuik | Cal | Kirkhill | Newton |
| Kirklee | see Botanic Gardens | |||||||
| Kirton | 0m 1333y | 1849 | open | MS&L | GC | Kirton Lindsay | Scawby & Hibaldstowe | |
| Kitsonwood | 0m 290y | 1849 | open | L&Y | L&Y | Stansfield Hall | Cornholme | |
| Knackershole | see Nightcote | |||||||
| Knaresborough | 0m 178y | 1851 | open | Y&NM | NE | Knaresborough | Goldsborough | |
| Knighton | 0m 104y | 1840 | open | Mid Co | Mid | Wigston South | Leicester | |
| Knighton Goods | 0m 106y | 1893 | 1986 | Mid | Mid | Wigston South | Leicester | |
| Knight's Hill | also called Tulse Hill | 0m 331y | 1868 | open | LBSC | LBSC | North Dulwich | Tulse Hill |
| Knightswood | 0m 270y | 1886 | open | GC&D | NB | Anniesland | Westerton | |
| Knockholt | see Chelsfield | |||||||
| Knowlerhill | see Littletown | |||||||
| Knowlesands | closed 1963, reopened 1970 by Severn Valley Railway | 0m 44y | 1862 | open | SevV | GW | Eardington | Bridgnorth |
| Ladhope | closed 1969, reopened 2015 by NR | 0m 60y | 1849 | open | NB | NB | Bowland | Galashiels |
| Laigh Hill | 0m 31y | 1848 | 1970s (or 1985?)† | SCen | Cal | Dunblane | Kinbuck | |
| Lambton Coal Drops | see Deptford | |||||||
| Lancost | see Landcross | |||||||
| Landcross | also called Lancost | 0m 196y | 1872 | 1982 | LSW | LSW | Bideford | Torrington |
| Lasswade | see Broomieknowe | |||||||
| Lazonby | 0m 99y | 1875 | open | Mid | Mid | Little Salkeld | Lazonby & Kirkoswald | |
| Lea | see Mitcheldean | |||||||
| Lea Wood | 0m 315y | 1849 | open | MBMMJ | Mid | Whatstandwell | Cromford | |
| Leachabhuidh No77 | 0m 88y | 1901 | open | WHE | NB | Glenfinnan | Lochailort | |
| Leachabhuidh No78 | 0m 66y | 1901 | open | WHE | NB | Glenfinnan | Lochailort | |
| Leacon Lane | 120m✖equivalent to 0m 131y | 2003 | open | CTRL | CTRL | Ebbsfleet International | Folkestone Channel Tunnel Terminal | |
| Lea Mount | see Kennaway | |||||||
| Ledbury | 0m 1323y | 1861 | open | WMid | GW | Ledbury | Colwall | |
| Lee | see Blackheath | |||||||
| Lee Bank | 0m 267y | 1874 | 1960 | H&O | H&O | Halifax North Bridge | Ovenden | |
| Lee Bere | see Leigh Bere | |||||||
| Leek | 0m 472y | 1849 | 1965 | NS | NS | Leek | Rudyard Lake | |
| Leek Brook | see Cheddleton | |||||||
| Lees Moor | 0m 1533y | 1884 | 1956 | GN | GN | Cullingworth | Ingrow | |
| Leigham | also called Higher Leigham or Leigham Vale | 0m 302y | 1868 | open | LBSC | LBSC | Tulse Hill | Streatham |
| Leigham Court | also called Streatham Hill | 0m 443y | 1856 | open | WLCP | LBSC | Tulse Hill | Streatham Hill |
| Leigham Vale | see Leigham | |||||||
| Leigh Beer | also called Shaugh or Shaugh Prior or Lee Bere | 0m 307y | 1859 | 1966 | SD&T | GW | Shaugh Bridge | Yelverton |
| Leith Walk | 0m 42y | 1868 | open | NB | NB | Easter Road | Leith Walk | |
| Lesmahagow | 0m 77y | 1905 | 1968 | Cal | Cal | Blackwood | Lesmahagow | |
| Levenshulme | 0m 48y | 1892 | 1988 | MCS | GC | Fallowfield | Levenshulme South | |
| Lever Street | see Bolton | |||||||
| Lewes | 0m 395y | 1847 | open | LBSC | LBSC | Cooksbridge | Lewes | |
| Leytonstone | also called Whipps Cross; cut back to 0m 49y | 0m 108y | 1856 | open | EC | GE | Leytonstone | Snaresbrook |
| Lightcliffe | also called Bolton Hill | 0m 70y | 1850 | open | L&Y | L&Y | Lightcliffe | Wyke & Norwood Green |
| Lime Street | also called Edge Hill or The Great Tunnel; original length: cut back 1885 to 0m 172y; Tunnels left at Copperas Hill, Russell Street, Lime Street, Mount Pleasant, Crown Street, Smithdown Lane and Overbury Street | 1m 460y | 1901 | open | WHE | LNW | ||
| Lime Street No 1 | up slow line only | 0m 83y | 1836 | open | L&M | LNW | Edge Hill | Liverpool Lime Street |
| Lime Street No 2 | up slow line only | 0m 67y | 1836 | open | L&M | LNW | Edge Hill | Liverpool Lime Street |
| Limpsfield | also called Hurst Green | 0m 556y | 1884 | open | C&OJ | C&OJ | Oxted | Hurst Green |
| Lindal | also called Crooklands; cut back to 0m 412y in 2011 | 0m 439y | 1851 | open | Fur | Fur | Lindal | Dalton |
| Linslade (First New) | east bore: slow line | 0m 272y | 1859 | open | LNW | LNW | Leighton Buzzard | Bletchley |
| Linslade (Old) | centre bore: mixed | 0m 272y | 1838 | open | L&Bm | LNW | Leighton Buzzard | Bletchley |
| Linslade (Second New) | west bore: fast line | 0m 272y | 1876 | open | LNW | LNW | Leighton Buzzard | Bletchley |
| Lion's Holt | see Blackboy | |||||||
| Lisburn Road | 0m 107y | 1874 | open | BCen | BCen | Belfast Windsor | Belfast Botanic | |
| Lismore Circus | north bore: fast lines | 0m 114y | 1867 | open | Mid | Mid | Kentish Town | West Hampstead |
| Lismore Circus | south bore: slow lines | 0m 109y | 1867 | open | Mid | Mid | Kentish Town | West Hampstead |
| Lisummon | 0m 1759y | 1864 | 1957 | N&A | GNI | Goraghwood | Ballydogherty Halt | |
| Litchfield | 0m 198y | 1840 | open | LSW | LSW | Basingstoke | Micheldever | |
| Little | see Wescoe | |||||||
| Little Browns No.1 | see Edenbridge No.1 | |||||||
| Little Browns No.2 | see Edenbridge No.2 | |||||||
| Littlebury | 0m 407y | 1845 | open | EC | GE | Audley End | Great Chesterford | |
| Littletown | also called Knowler Hill or Liversedge | 0m 79y | 1848 | 1965 | L&Y | L&Y | Liversedge | Cleckheaton |
| Littleworth | see Horspath | |||||||
| Litton | 0m 516y | 1863 | 1968 | Mid | Mid | Miller's Dale | Monsal Dale | |
| Livermead | also called Torquay or Breakneck or Hollicombe | 0m 133y | 1859 | 1910† | D&T | GW | Torquay | Paignton |
| Liverpool Central | see Great George Street | |||||||
| Liverpool Independent Lines | see Crewe Coal Yard Junction | |||||||
| Liverpool Road | see Ditton | |||||||
| Liverpool Street | 0m 67y | 1988 | open | BR | BR | Salford Crescent | Deansgate | |
| Liversedge | see Littletown | |||||||
| Llanberis | see Cwm-y-Glo | |||||||
| Llandderfel | 0m 159y | 1868 | 1964 | C&Bala | GW | Llandderfel | Bala Junction | |
| Llandegai | 0m 505y | 1848 | open | C&H | LNW | Aber | Bangor | |
| Llangammarch | 0m 56y | 1867 | open | CWalE | LNW | Llangammarch | Garth | |
| Llangollen Road | see Whitehurst | |||||||
| Llangyfelach | 1m 192y | 1912 | open | GW | GW | Langyfelach | Felinfran | |
| Llangynllo | also called Llangunllo or Llyncoch | 0m 674y | 1864 | open | CWales | LNW | Llangunllo | Knighton |
| Llanrwst | 0m 85y | 1868 | open | LNW | LNW | North Llanrwst | Llanrwst | |
| Llantarnam | see Llantarnam Road | |||||||
| Llantarnam Road | also called Llantarnam or Malpas; originally up to 180y; cut back pre-1882 | 0m 41y | 1852 | 1963 | NS&C | GW | Marshes Turnpike Gate | Llantarnam |
| Llyncoch | see Llangynllo | |||||||
| LNWR | see Chapel | |||||||
| Loanhead | 0m 43y | 1847 | 1989 | EL&R | NB | Loanhead | Roslin | |
| Lochailort | 0m 176y | 1901 | open | WHE | NB | Lochailort | Beasdale | |
| Lochburn | also called Possil Park; aqueduct with twin compartments | 0m 30y | 1858 | open | GD&H | NB | Lochburn | Possilpark |
| Loch Lomondside | see Creag-an-Ardain | |||||||
| Loch nan Uamh No 116 | 0m 66y | 1901 | open | WHE | NB | Lochailort | Beasdale | |
| Loch nan Uamh No 117 | 0m 99y | 1901 | open | WHE | NB | Lochailort | Beasdale | |
| Loch Oich | also called Aberchalder or Oich | 0m 67y | 1903 | 1946 | I&FA | NB | Invergarry | Aberchalder |
| Loch Treig | see Fersit | |||||||
| Lockleys Hill | see Welwyn South | |||||||
| Lockwood | also called Yew Green | 0m 205y | 1850 | open | L&Y | L&Y | Huddersfield | Lockwood |
| Lodge Hill | see Wingfield | |||||||
| London Road | also called Maidstone | 0m 53y | 1856 | open | SE | SE | Maidstone Barracks | Maidstone West |
| London Road | also called Parkhead | 0m 1312y | 1897 | 1964 | Cal | Cal | Bridgeton Cross | Parkhead |
| London Road | 0m 44y | 1837 | open | N&C | NE | Carlisle Citadel | Scotby | |
| London 1 [west] | down line | 7.516km✖equivalent to 4m 1180y | 2007 | open | CTRL | CTRL | St Pancras International | Stratford International |
| London 1 [west] | up line | 7.538km✖equivalent to 4m 1204y | 2007 | open | CTRL | CTRL | St Pancras International | Stratford International |
| London 2 [east] | twin bores | 10.120km✖equivalent to 6m 507y | 2007 | open | CTRL | CTRL | Stratford International | Ebbsfleet International |
| Long | see Bray Head No 4 | |||||||
| Long Arch Bridge | see Ashey Down | |||||||
| Long Arch Bridge | also called The Long Arch or Midford | 0m 37y | 1874 | 1966 | S&D | S&DJ | Bath Green Park | Midford |
| Longdown | see Perridge | |||||||
| Long Itchington Wood | twin bore; additional ≈0.100km with portal structure; directly abuts Long Itchington Wood 'Green' tunnel | ≈1.472km | under construction | HS2 | HS2 | Birmingham Interchange | Old Oak Common | |
| Long Itchington Wood 'Green' | twin bore; length includes portal structure; directly abuts Long Itchington Wood tunnel | ≈0.438km | under construction | HS2 | HS2 | Birmingham Interchange | Old Oak Common | |
| Longland | 0m 101y | 1840 | 1931† | NMid | Mid | Belper | Ambergate | |
| Longlands Diveunder | 0m 56y | 1933 | open | LNER | LNER | Northallerton station loop line | ||
| Longridge | also called Stone Bridge | 0m 43y | 1847 | 1967 | P&L | FPWR | Grimsargh | Longridge |
| Lonlas | also called Peniel Green | 0m 924y | 1912 | open | GW | GW | Felinfran | Llandarcy |
| Lord's | east bore now combined with St John's Wood | formerly 0m 236y | 1899 | open | GC | GC | Marylebone | Harrow-On-The-Hill |
| Lord's | middle bore; never opened | 0m 236y | GC | GC | Marylebone | Harrow-On-The-Hill | ||
| Lord's | west bore; never opened | 0m 236y | GC | GC | Marylebone | Harrow-On-The-Hill | ||
| Lordsfield Avenue | see Turner Lane | |||||||
| Loughgilly | 0m 365y | 1864 | 1957 | N&A | GNI | Ballydogherty Halt | Glenanne | |
| Lower Ince | 0m 65y | 1884 | 1969 | WigJ | GC | Hindley South | Lower Ince | |
| Lower Redbrook | see Redbrook No 1 | |||||||
| Lower Park Street | 0m 127y | 1837 | open | L&Bm | LNW | Euston | Camden | |
| Low Moor | see Oakenshaw | |||||||
| Loxley | see Bromshall | |||||||
| Lucas Street | see Tanners Hill | |||||||
| Ludlow | 0m 134y | 1853 | open | S&H | GW | Ludlow | Woofferton | |
| Lumphinnans | 0m 62y | 1848 | 1966 | E&N | NB | Cowdenbeath Old | Lochgelly | |
| Luxulyan | also called Bridges | 0m 52y | 1874 | open | CwMin | GW | St Blazey | Luxulyan |
| Lydbrook | also called Coppet Hill or Bicknor | 0m 630y | 1873 | 1965 | R&M | R&M | Lydbrook Junction | Kerne Bridge |
| Lydden | also called Shepherds Well | 1m 609y | 1859 | open | LCD | LCD | Shepherds Well | Stonehall & Lydden Halt |
| Lydgate | also called Grotton or Greenfield | 0m 1331y | 1856 | 1964 | LNW | LNW | Grotton & Springhead | Grasscroft |
| Lyndhurst Road | twin bores | 0m 66y | 1888 | open | LSW | LSW | Hinton Admiral | Christchurch |
| Lynedoch Street | 0m 41y | 1869 | 1991 | G&A | G&SW | Greenock Princes Pier | Greenock Lynedoch | |
| Lynedoch Street Goods | 0m 50y | 1869 | 1966 | G&A | G&SW | Greenock Princes Pier | Lynedoch Goods | |
| Lywood | 0m 215y | 1883 | 1963 | LBSC | LBSC | Horsted Keynes | Ardingley | |
| M18 | also called Hellaby; temporary structure during M18 construction | ≈0m 100y | 1966 | 1966 | BR | [RM&L] | North of Hellaby goods branch | |
| Maberley | see Hutcheon Street | |||||||
| Macclesfield | see Hibel Road | |||||||
| Madeira Park | see Grove | |||||||
| Maenclochog | see Castle | |||||||
| Maesteg | see Cymmer | |||||||
| Maiden Lane | see Gasworks | |||||||
| Maiden Lane Curve | possibly never used | 0m 244y | ≈1863 | ? | Met | Met | Kings Cross York Road | Kings Cross St Pancras |
| Maidstone | see London Road | |||||||
| Maldon West | 0m 66y | 1889 | 1959 | GE | GE | Maldon West | Barons Lane Halt | |
| Malmesbury | 0m 105y | 1877 | 1962 | Malm | GW | Great Somerford | Malmesbury | |
| Malpas | see Llantarnam Road | |||||||
| Manchester Docks | east bore: down line | 0m 46y | 1895 | after 1955 | LNW | LNW | Eccles | Manchester Docks |
| Manchester Docks | west bore: up line | 0m 46y | 1895 | after 1955 | LNW | LNW | Eccles | Manchester Docks |
| Manchester Independent Lines | see Crewe Sydney Bridge Junction | |||||||
| Manchester Road | 0m 312y | 1876 | 1972 | GN | GN | Laisterdyke | Horton Park | |
| Manchester Road | closed 1991, reopened 1992 by GMM | 0m 65y | 1898 | open | L&Y | L&Y | Radcliffe New | Broadfield |
| Manifold | see Swainsley | |||||||
| Mansfield Road | 0m 1189y | 1898 | 1968 | GC | GC | Nottingham Victoria | Carrington | |
| Mansfield Road | 0m 121y | 1901 | 1955 | Mid | Mid | Clay Cross | Bond's Main Branch | |
| Manton | 0m 749y | 1848 | open | Mid | Mid | Manton | Oakham | |
| Mapperley | 0m 1132y | 1875 | 1960 | GN | GN | Daybrook | Gedling & Carlton | |
| Mark Beech | also called Cowden | 0m 1341y | 1888 | open | LBSC | LBSC | Hever | Cowden |
| Marlborough | also called Savernake | 0m 648y | 1898 | 1964 | Marl&G | MSW | Marlborough Low Level | Savernake High Level |
| Marley (New) | south bore: down line | 0m 869y | 1893 | open | GW | GW | Totnes | Brent |
| Marley (Old) | north bore: up line | 0m 869y | 1848 | open | SDev | GW | Totnes | Brent |
| Marple No 1 | also called Marple North | 0m 197y | 1865 | open | MNMH | Sh&MJ | Compstall | Marple |
| Marple No 2 | also called Marple South | 0m 224y | 1865 | open | MNMH | Sh&MJ | Marple | Strines |
| Marple North | see Marple No 1 | |||||||
| Marple South | see Marple No 2 | |||||||
| Marsden & Diggle | see Standedge New | |||||||
| Marsh Lane | see Richmond Hill | |||||||
| Marsh Lane Station | also called New Strand | 0m 49y | 1885 | 1968 | Mid | Mid | Alexandra Docks branch | |
| Marteg | 0m 372y | 1864 | 1962 | MWales | GW | Marteg | St Harmons | |
| Martello | also called Folkestone Warren | 0m 533y | 1844 | open | SE | SE | Folkestone East | Folkestone Warren Halt |
| Matlock | closed 1968, reopened 1991 by Peak Rail | 0m 33y | 1849 | open | MBMMJ | Mid | Matlock Bath | Matlock |
| Maudlands | see Deepdale No 1 | |||||||
| Mayfield | 0m 91y | 1880 | 1965 | LBSC | LBSC | Rotherfield | Mayfield | |
| Maypool | see Greenway | |||||||
| Maze Hill | see Greenwich College | |||||||
| Meadowbank | see St Margaret's (Edinburgh) | |||||||
| Meir | 0m 814y | 1848 | open | NS | NS | Meir | Normacot | |
| Melling | 0m 1230y | 1867 | open | F&MJ | F&MJ | Wennington | Melling | |
| Merkland Street | 0m 153y | 1896 | 1978 | L&D | Cal | Partick Central | Partick West | |
| Merley | ≈0m 36y | 1847 | 1977 | Stn&D | LSW | Wimbourne | Broadstone | |
| Mersey | basic tunnel | 1m 350y | 1886 | open | Mersey | Mersey | James Street | Birkenhead Central |
| Mersey✖Mersey full length 4m 462y including loop line and extension | 4m 462y | 1888 | open | Mersey | Mersey | Hamilton Square | Birkenhead Park | |
| Mersey✖Mersey full length 4m 462y including loop line and extension | 4m 462y | 1892 | open | Mersey | Mersey | James Street | Liverpool Central Low Level | |
| Mersey✖Mersey full length 4m 462y including loop line and extension | 4m 462y | 1978 | open | BR | BR | Liverpool Deep Level Loop | ||
| Mersham | 0m 174y | 1843 | open | SE | SE | Ashford | Smeeth | |
| Mersham | 160m✖equivalent to 0m 175y | 2007 | open | CTRL | CTRL | Ebbsfleet International | Folkestone Channel Tunnel Terminal | |
| Merstham New | see Quarry | |||||||
| Merstham Old | built 1841 by L&Br, sold 1844 to SE, joint use to 1899 | 1m 71y | 1841 | open | L&BR | SE | Coulsdon South | Merstham |
| Merthyr | also called Abernant or Abercanaid | 1m 737y | 1853 | 1962 | VoN | GW | Abernant | Merthyr Tydfil |
| MGW Docks Branch | west bore: up line | 0m 33y | 1877 | open | GS&W | GS&W | Islandbridge Junction | Glasnevin Junction |
| MGW Docks Branch | east bore: down line | 0m 33y | 1877 | open | GS&W | GS&W | Islandbridge Junction | Glasnevin Junction |
| Mickleham | also called Norbury or Box Hill | 0m 524y | 1867 | open | LBSC | LBSC | Leatherhead | Boxhill & Burford Bridge |
| Mickleover | closed 1968, used as test track thence until 1971 | 0m 464y | 1878 | 1971 | GN | GN | Mickleover | Derby Friargate |
| Mickleton | see Campden | |||||||
| Middle Hill | 0m 198y | 1841 | open | GW | GW | Box | Box (Mill Lane) Halt | |
| Middleton Railway | M621 tunnel | 0m 87y | 1972 | open | Middleton | Middleton | Moor Road | Park Halt |
| Middleton Top | see Hopton | |||||||
| Middlewood | 0m 53y | 1857 | open | SDWB | LNW | Middlewood | Disley | |
| Midford | see Long Arch Bridge | |||||||
| Midhurst | 0m 276y | 1866 | 1964 | LBSC | LBSC | Selham | Midhurst | |
| Midway | 0m 104y | 1880 | 1966 | Mid | Mid | Swadlincote | Woodville | |
| Mierystock | 0m 242y | 1874 | 1956 | SWSB | GW&Mid | Upper Lydbrook | Speech House Road | |
| Miley | see Deepdale No 1 | |||||||
| Milford | see Chevin | |||||||
| Mill Hill | 0m 208y | 1862 | 1966 | C&N | IoWC | Mill Hill | Cowes | |
| Mill Of Ash | see Ashfield | |||||||
| Millwood | 0m 225y | 1841 | open | M&L | L&Y | Todmorden | Eastwood | |
| Mitcheldean | also called Lea or Boxbush | 0m 782y | 1855 | 1965 | HR&G | GW | Longhope | Mitcheldean Road |
| Mitre | 0m 48y | 1844 | open | GW | GW | Old Oak Common | West London line | |
| Moel Llys | 0m 154y | 1848 | open | C&H | LNW | Penmaenmawr | Llanfairfechan | |
| Moelwyn | also called New Moelwyn | 0m 294y | 1977 | open | FestR | FestR | Dduallt | Llyn Ystradau |
| Moelwyn (Old) | 0m 730y | 1842 | 1946 | Fest | Fest | Dduallt | Moelwen | |
| Molewood | 0m 364y | 1918 | open | GN | GN | Hertford North | Stapleford | |
| Moncrieffe | also called Hilton | 0m 1220y | 1848 | open | SCen | Cal | Forgandenny | Perth |
| Monks Ferry | original length; cut back to 0m 371y | ≈0m 477y | 1844 | 1966 | C&Bhd | Birk | Rock Ferry | Birkenhead Monks Ferry |
| Monmouth | 0m 148y | 1857 | 1964 | CMUP | GW | Dingestowe | Monmouth Troy | |
| Monsal Head | see Headstone | |||||||
| Montpelier | 0m 288y | 1874 | open | CE | CE | Fishponds | Montpelier | |
| Monument Lane | see New Street North | |||||||
| Moorcock | 0m 98y | 1875 | open | Mid | Mid | Garsdale | Kirkby Stephen | |
| Moorcroft | see Morcott | |||||||
| Moorgate | 2m 572y | 1904 | open | GN&C | GN&C | Moorgate | Drayton Park | |
| Moor Lane | see Bullfield | |||||||
| Moore Vale | 0m 56y | 1854 | 1965 | N&E | GNI | Newry Edward Street | Goraghwood | |
| Morcott | also called Moorcroft | 0m 448y | 1851 | 1966 | LNW | LNW | Seaton | Morcott |
| Morfor | see Aberdovey No 2 | |||||||
| Morlais | 0m 1037y | 1912 | open | LNW | LNW | Pontsarn | Pantysgallog Low Level | |
| Morley | 0m 238y | 1878 | 1968 | GN | GN | West Hallam | Breadsall | |
| Morley | 1m 1609y | 1848 | open | LNW | LNW | Morley | Batley | |
| Moseley | 0m 155y | 1840 | open | Mid | Mid | Kings Heath | Moseley | |
| Moseley Green | 0m 503y | 1872 | 1951 | S&Wye | GW&Mid | Lydney Town | Forest of Dean mineral loop | |
| Mosesfield | also called Balornock | 0m 88y | 1894 | 1965 | Cal | Cal | Springburn Park | Robroyston |
| Mossdale Head | 0m 245y | 1878 | 1959 | Mid | Mid | Garsdale | Hawes | |
| Mossgiel | 0m 684y | 1846 | open | GPKA | G&SW | Kilmarnock | Auchinleck | |
| Moss Hill | see Brymbo | |||||||
| Motherwell | 0m 46y | 1849 | by 1895† | Cal | Cal | Motherwell | Flemington | |
| Mount Elliot | 0m 748y | 1887 | 1963 | DW&W | DSE | Rathgarogue | New Ross | |
| Mount Pleasant | 0m 143y | 1851 | open | SE | SE | Hastings | Ore | |
| Mount Pleasant (New) | main bore; formerly 0m 134y | 0m 366y | 1860s | open | LNW | LNW | Edge Hill | Liverpool Lime Street |
| Mount Pleasant (Old) | north bore: up slow line; formerly 0m 134y | 0m 366y | 1836 | open | L&M | LNW | Edge Hill | Liverpool Lime Street |
| Mount Pleasant | 0m 123y | 1862 | 1970 | SevV | GW | Bewdley | Burlish | |
| Mount Street | 0m 121y | 1849 | open | SE | SE | Charlton | Woolwich Dockyard | |
| Mountfield | 0m 526y | 1852 | open | SE | SE | Robertsbridge | Mountfield | |
| Murdercombe | originally 2' gauge, enlarged ≈1943 | 0m 55y | ≈1943 | open | ARC | [GW] | Frome | Whatley Quarry branch |
| Murthly | see Kingswood | |||||||
| Mutley | length includes 134y of car park above track | 0m 317y | 1849 | open | SDev | GW | Lipson Vale | Mutley |
| Mymms | see Potters Bar | |||||||
| Mythe | see Tewkesbury | |||||||
| Mytholmes | also called Oakworth; closed 1961, reopened 1968 by K&WVR | 0m 75y | 1892 | open | K&WV | Mid | Oakworth | Haworth |
| Nags Head | see Hoe Street | |||||||
| Narberth | 0m 273y | 1866 | open | P&T | GW | Narberth | Templeton | |
| Navigation Hill | see Nunnery No2 | |||||||
| Neasden Depot | northbound diveunder | 0m 129y | 1882 | open | Met | LT | Neasden Depot | Wembley Park |
| Neidpath | also called Castle Hill or Cademuir Hill | 0m 601y | 1864 | 1954 | Cal | Cal | Peebles | Lyne |
| Nelson | see Standedge (second) | |||||||
| Netherton | 0m 333y | 1868 | 1965 | L&Y | L&Y | Lockwood | Netherton | |
| New Brompton | see Gillingham | |||||||
| Newcastle | also called Hartshill West or Newcastle West | 0m 577y | 1852 | 1966 | NS | NS | Hartshill & Basford | Newcastle-under-Lyme |
| Newcastle East | see Hartshill | |||||||
| Newcastle West | see Newcastle | |||||||
| Newchurch No 1 | 0m 162y | 1852 | 1956 | ELancs | L&Y | Waterfoot | Stacksteads | |
| Newchurch No 2 | 0m 290y | 1852 | 1956 | ELancs | L&Y | Waterfoot | Stacksteads | |
| New Clydach | see Gelli Felin | |||||||
| New England | see Hove | |||||||
| New Furnace | also called New Works | 0m 69y | 1850 | open | L&Y | L&Y | Wyke & Norwood Green | Low Moor |
| Newhaven | 0m 51y | 1830 | 1967 | CH&P | LNW | Friden | Parsley Hay | |
| Newland | 0m 278y | 1883 | 1916 | Cfrd | GW | Newland | Coleford | |
| Newline | see Britannia | |||||||
| Newmarket | see Warren Hill | |||||||
| New Mills | 0m 123y | 1866 | open | Mid | Mid | New Mills Central | Buxworth | |
| New Mills (Hayfield) | see Hayfield | |||||||
| New Moelwyn | see Moelwyn | |||||||
| Newnham | 0m 235y | 1851 | open | SWal | GW | Newnham | Awre Junction | |
| Newport (New) | west bore: main lines; also called Hillfield | 0m 762y | after 1900 | open | SWal | GW | Newport | Marshfield |
| Newport (Old) | east bore: relief lines; also called Hillfield | 0m 742y | 1850 | open | SWal | GW | Newport | Marshfield |
| Newport | also called Snooks Hill | 0m 83y | 1875 | 1966 | R&N | IoWC | Wootton | Newport |
| Newport | original line | 0m 133y | 1894 | 1896 | MGW | MGW | Westport | Newport |
| Newport | diversion line | 0m 88y | 1896 | 1937 | MGW | MGW | Westport | Newport |
| New Pudsey | 0m 52y | 1854 | open | LBHJ | GN | New Pudsey | Laisterdyke | |
| Newquay Harbour | 0m 85y | 1849 | 1926 | Newquay | GW | Newquay Harbour branch | ||
| New Strand | see Marsh Lane Station | |||||||
| New Street North | also called Monument Lane; formerly 760y | 0m 931y | 1852 | open | LNW | LNW | Birmingham New Street | Monument Lane |
| New Street South (New) | south bore; formerly 266y | 0m 370y | 1896 | open | Mid | LNW/Mid | Adderley Park | Birmingham New Street |
| New Street South (Old) | also called Worcester Street; north bore; formerly 254y | 0m 305y | 1854 | open | LNW | LNW/Mid | Adderley Park | Birmingham New Street |
| Newton Street | also known as Greenock | 1m 351y | 1889 | open | Cal | Cal | Greenock West | Fort Matilda |
| Newtown | also called Albion Road | 0m 90y | 1902 | open | Mid | Mid | Buxworth | Hazel Grove |
| New Walk | original length; cut back to 0m 28y in 1892 | 0m 53y | 1840 | open | MidC | Mid | Welford Road | Leicester |
| New Works | see New Furnace | |||||||
| Nicholson | see Standedge (first) | |||||||
| Nightcote | also called Nightcott or Knackershole | 0m 44y | 1873 | 1966 | Dev&S | GW | Dulverton | East Anstey |
| Norbury | see Mickleham | |||||||
| Northallerton | 0m 48y | 1852 | open | LN | NE | Northallerton Low | Northallerton Town | |
| Northchurch (Old) | west bore: fast lines | 0m 349y | 1837 | open | L&Bm | LNW | Berkhamsted | Tring |
| Northchurch (First New) | first east bore: slow line | 0m 349y | 1859 | open | LNW | LNW | Berkhamsted | Tring |
| Northchurch (Second New) | second east bore: slow line | 0m 349y | 1876 | open | LNW | LNW | Berkhamsted | Tring |
| North Bridge | see Old Lane | |||||||
| North Downs | also called Bluebell Hill | 3.199km✖equivalent to 1m 1738y | 2003 | open | CTRL | CTRL | Ebbsfleet International | Folkestone Channel Tunnel Terminal |
| North Enfield | see Hadley Wood North | |||||||
| Northgate Street (New) | north bore: up line | 0m 104y | 1904 | open | LNW | LNW/GWJt | Chester | Saltney |
| Northgate Street (Old) | south bore: down line | 0m 104y | 1846 | open | S&C | LNW/GWJt | Chester | Saltney |
| North Hag | see Haslingden | |||||||
| North Leith | see Coburg Street | |||||||
| Northolt | twin bore | ≈13.420km | under construction | HS2 | HS2 | Birmingham Interchange | Old Oak Common | |
| North Queensferry | 0m 569y | 1890 | open | FB | FB | Inverkeithing | North Queensferry (Forth Bridge) | |
| North Shields | original length✖North Shields closed 1980, reopened 1982 by TWM and partially opened out into three sections | 0m 786y | 1839 | 1980 | N&Bwk | NE | North Shields | Tynemouth |
| North Shields East | revised length✖North Shields closed 1980, reopened 1982 by TWM and partially opened out into three sections | 0m 429y | 1982 | open | TWM | TWM | North Shields | Tynemouth |
| North Shields Middle | also called Church Street✖North Shields closed 1980, reopened 1982 by TWM and partially opened out into three sections | 0m 38y | 1982 | open | TWM | TWM | North Shields | Tynemouth |
| North Shields West | also called King Street✖North Shields closed 1980, reopened 1982 by TWM and partially opened out into three sections | 0m 93y | 1982 | open | TWM | TWM | North Shields | Tynemouth |
| North Stoke | 0m 83y | 1863 | open | LBSC | LBSC | Amberley | Arundel | |
| North Street | see Audenshaw Road (Old) | |||||||
| Norwood End | 0m 300y | 1878 | 1961 | Mid | Mid | Killamarsh West | Kiveton Park branch | |
| Nottage | 0m 63y | 1861 | 1966 | LlviV | GW | Nottage Halt | Porthcawl | |
| Nunnery | see Cricket Inn | |||||||
| Nunnery No 1 | also called Woodbourne | 0m 106y | 1903 | 1965 | LNW | LNW | Darnall | City Goods branch |
| Nunnery No 2 | also called Navigation Hill | 0m 335y | 1903 | 1965 | LNW | LNW | Darnall | City Goods branch |
| Nutfield | see Bletchingley | |||||||
| Nuttall | closed 1980, reopened 1987 by East Lancashire Railway | 0m 115y | 1846 | open | ELancs | L&Y | Summerseat | Ramsbottom |
| Oakamoor | 0m 488y | 1849 | 1965 | NS | NS | Kingsley & Froghall | Oakamoor | |
| Oakengates | 0m 471y | 1849 | open | S&Bm | GW | Oakengates | Telford Central | |
| Oakenshaw | also called Low Moor | 0m 67y | 1848 | 1965 | L&Y | L&Y | Low Moor | Cleckheaton |
| Oakleigh Park | see Barnet | |||||||
| Oakworth | see Mytholmes | |||||||
| Oatlands | ≈0m 55y | 1882 | 1938 | C&WJ | C&WJ | Distington | Oatlands | |
| Obelisk Hill | 0m 25y | 1854 | open | D&W | DSE | Dalkey | Killiney | |
| Ocker Hill | 0m 88y | 1863 | 1981 | SS | LNW | Ocker Hill | Tipton | |
| Oich | see Loch Oich | |||||||
| Old Blackrock Road | 0m 26y | 1851 | 1961 | CBSC | CBSC | Cork Albert Quay | Waterfall | |
| Oldham | original length; also called Sheepwashers Lane or Park Road; cut back to 0m 59y | 0m 152y | 1861 | 1967 | OAGB | OAGB | Oldham Clegg Street | Park Bridge |
| Old Hill | also called Blackheath or Rowley | 0m 896y | 1867 | open | Stour | GW | Old Hill | Rowley Regis |
| Old Lane | also called Woodside or North Bridge | 0m 402y | 1874 | 1960 | H&O | H&O | Halifax North Bridge | Oxenden |
| Old Macclesfield Road | 0m 24y | 1831 | 1954 | C&HP | C&HP (LNW) | Ladmanlow | Bunsall | |
| Old Oak Common | twin bore | ≈0.330km | under construction | HS2 | HS2 | Birmingham Interchange | Old Oak Common | |
| Old Parks | see Ashby de la Zouch | |||||||
| Old Trafford | 0m 142y | 1849 | open | MSJA | MSJA | Deansgate | Old Trafford | |
| Old Warden | see Warden | |||||||
| Old Woodhouselee | see Firth | |||||||
| Olive Mount | closed 1987, reopened 2009 by NR | 0m 147y | 1883 | open | LNW | LNW | Edge Lane | Broad Green |
| Orangefield | also called Wellington Street | 0m 144y | 1869 | 1991 | G&A | G&SW | Greenock Princes Pier | Greenock Lynedoch |
| Ore | 0m 1397y | 1851 | open | SE | SE | Ore | Three Oaks | |
| Oriel Road | 0m 288y | 1880 | open | LNW | LNW | Spellow | Bootle Balliol Road | |
| Ossett No.1 | see Chickenley Heath No.1 | |||||||
| Ossett No.2 | see Chickenley Heath No.2 | |||||||
| Otley | 0m 89y | 1865 | 1965 | NE | NE | Otley | Pool | |
| Otley & Bradford Road | see Bradford | |||||||
| Ovalgate Cliff | constructed but abandoned when line was diverted before opening; tunnel name assumed; length as planned | 0m 40y | WRMU | WRMU | Sandsend | Kettleness | ||
| Overbury Street | also called Overton Street or Harbord Street | 0m 144y | 1836 | open | L&M | LNW | Edge Hill | Liverpool Lime Street |
| Overton Street | see Overbury Street | |||||||
| Oxenden (New) | east bore: up line; also called Great Oxenden | 0m 453y | 1879 | 1984 | LNW | LNW | Clipstone & Oxenden | Market Harborough |
| Oxenden (Old) | west bore: down line; also called Great Oxenden | 0m 462y | 1859 | 1984 | LNW | LNW | Clipstone & Oxenden | Market Harborough |
| Oxspring (New) | west bore: up line | 0m 558y | 1879 | 1984 | MS&L | GC | Penistone | Silkstone |
| Oxspring (old) | east bore: down line | 0m 558y | 1854 | open | MS&L | GC | Penistone | Silkstone |
| Oxted | also called Godstone or Woldingham | 1m 501y | 1884 | open | CO&EG | CO&EG | Woldingham | Oxted |
| Padarn | see Cwm-y-Glo | |||||||
| Paddington Canal Aqueduct | 0m 43y | 1844 | 1860 | WL | WL | West London junction with Great Western | West London junction with London & Birmingham | |
| Paddock | cut back pre-1854; originally ≈0m 800y | 0m 43y | 1849 | ≈1966 | LNW | LNW | Huddersfield | Longwood |
| Padley | see Totley | |||||||
| Parkhead | see London Road | |||||||
| Park Hill | closed 1963, reopened 2000 by CT | 0m 122y | 1885 | open | WSC | WSC | Bingham Road | Coombe Road |
| Park Lane | ≈0m 220y | 2002 | open | TWM | TWM | Sunderland | Park Lane | |
| Park Lane Goods North | see Wapping Goods North | |||||||
| Park Lane Goods South | see Wapping Goods South | |||||||
| Park Road | see Oldham | |||||||
| Park Street | tunnel extended: originally 0m 143y | 0m 215y | 1849 | open | SS | LNW | Walsall | Birchills |
| Park Street | see Upper Park Street and Lower Park Street | |||||||
| Parkwood Street | see Keighley Goods | |||||||
| Parson's | also called Parson's Rock or Holcombe or Hole Head or Smugglers; extended from 374y in 1920 | 0m 512y | 1948 | open | GW | GW | Dawlish | Teignmouth |
| Parson's Rock | see Parson's | |||||||
| Parson's Rockfall Shelter | originally reported as 228y long | 0m 119y | 2023 | open | NR | [GW] | Dawlish | Teignmouth |
| Passage No 1 | 0m 157y | 1902 | 1932 | CB&P | CB&P | Passage | Glenbrook | |
| Passage No 2 | 0m 361y | 1902 | 1932 | CB&P | CB&P | Passage | Glenbrook | |
| Patcham | also called Clause | 0m 492y | 1841 | open | L&Br | LBSC | Hassocks | Preston Park |
| Patchway New (Up) | 1m 0y | 1886 | open | GW | GW | Patchway | Pilning | |
| Patchway Old (Down) | also called Almondsbury or Cattybrook | 0m 1246y | 1863 | open | BSWU | GW | Patchway | Pilning |
| Patchway Short | 0m 62y | 1863 | open | BSWU | GW | Patchway | Pilning | |
| Paxton | also called Upper Norwood or Crystal Palace or Sydenham or Rockhills | 0m 439y | 1865 | 1954 | CPSLJ | LCD | Upper Sydenham | Crystal Palace High Level |
| Peak | see Ravenscar | |||||||
| Peak Forest Junction | 0m 29y | 1866 | open | Mid | Mid | Peak Forest | Buxton | |
| Peascliffe | 0m 968y | 1852 | open | GN | GN | Grantham | Barkston | |
| Peebles | see Eshiels | |||||||
| Pelena | see Gyfylchi | |||||||
| Pemberton | 0m 40y | 1848 | open | L&Y | L&Y | Pemberton | Orrell | |
| Pembroke Dock | also called Golden Hill or Pembroke | 0m 460y | 1864 | open | P&T | GW | Golden Hill | Pembroke Dock |
| Penar | also called Pentwynmawr | 0m 239y | 1912 | 1989 | GW | GW | Risca | Penar Junction |
| Pencader | also called Allt Walis or Dolgran | 0m 988y | 1864 | 1973 | C&Car | GW | Llanpumpsaint | Pencader |
| Pencaedrain | 0m 526y | 1851 | 1967 | VoN | GW | Pontwalby | Rhigos | |
| Penclip | see Penmaenmawr | |||||||
| Pendlebury Fast | also called Bolton Road | 0m 202y | 1887 | 1965 | L&Y | L&Y | Swinton | Pendlebury |
| Pendlebury Slow | also called Bolton Road | 0m 199y | 1889 | open | L&Y | L&Y | Swinton | Pendlebury |
| Pendleton Down | 0m 41y | 1889 | open | L&Y | L&Y | Pendleton | Irlams o' th' Height | |
| Pendleton Middle | 0m 36y | 1887 | open | L&Y | L&Y | Pendleton | Irlams o' th' Height | |
| Pendleton Up | 0m 40y | 1889 | 1965 | L&Y | L&Y | Pendleton | Irlams o' th' Height | |
| Peniel Green | see Lonlas | |||||||
| Penge | also called Sydenham Hill | 1m 381y | 1863 | open | LCD | LCD | Sydenham Hill | Penge East |
| Penhelig Nos 1-4 | see Aberdovey No 4 | |||||||
| Penllergaer | 0m 284y | 1913 | open | GW | GW | Pont Lliw | Langyfelach | |
| Penmaenbach | officially given as 722y in 2026 | 0m 718y | 1848 | open | C&H | LNW | Conway | Penmaenmawr |
| Penmaenmawr | also called Penclip or Pen-y-Clip; formerly 0m 453y including avalanche shelters, now 0m 401y | 0m 253y without avalanche shelters | 1848 | open | C&H | LNW | Penmaenmawr | Llanfairfechan |
| Penmaenrhos | 0m 482y | 1848 | open | C&H | LNW | Llysfaen | Old Colwyn | |
| Penmansheil | collapsed 1979 and line diverted | 0m 267y | 1846 | 1979 | NB | NB | Grantshouse | Cockburnspath |
| Penshurst | 0m 78y | 1842 | open | SE | SE | Penshurst | Leigh | |
| Pentwynmawr | see Penar | |||||||
| Pen-y-Bont | 0m 404y | 1865 | open | CWales | LNW | Pen-y-Bont | Dolau | |
| Pen-y-Clip | see Penmaenmawr | |||||||
| Pen-y-Croes | see Tregarth No 2 | |||||||
| Pepper Hill | length with open box and Southfleet tunnel 0.515km (0m 563y) | 300m✖equivalent to 0m 328y; length given as 0.420km (0m 459y) in HS1's 'Register of Infrastructure' | 2003 | open | CTRL | CTRL | Ebbsfleet International | Folkestone Channel Tunnel Terminal |
| Perran | 0m 374y | 1863 | open | CWall | GW | Perranwell | Penrhyn | |
| Perridge | also called Longdown | 0m 829y | 1903 | 1958 | Exeter | Exeter (GW) | Ide | Longdown |
| Pershore Road | 0m 62y | 1885 | open | Mid | Mid | Bournville | Kings Norton | |
| Pettycur | see Kinghorn | |||||||
| Phillots | also called Horse Cove | 0m 49y | 1846 | open | SDev | GW | Dawlish | Teignmouth |
| Phoenix Park | 0m 757y | 1877 | open | GS&W | GS&W | Islandbridge Junction | Glasnevin Junction | |
| Pickering Nook | 0m 58y | 1855 | 1885 | WearV | WearV | colliery branch line | ||
| Pic Tor | also called Pig Tor | 0m 191y | 1863 | open | Mid | Mid | Buxton | Miller's Dale |
| Picko No 1 | 0m 52y | 1866 | open | LNW | LNW | Edge Hill | Edge Lane | |
| Picko No 2 | 0m 165y | 1866 | open | LNW | LNW | Edge Hill | Edge Lane | |
| Pig Tor | see Pic Tor | |||||||
| Pill | also called Ham Green | 0m 665y | 1867 | open | B&PP | GW | Ham Green Halt | Pill |
| Pill Sandstone | see Clifton Bridge No 3 | |||||||
| Pinmore | 0m 543y | 1877 | open | G&PJ | G&SW | Pinmore | Girvan | |
| Pinnock | 0m 1173y | 1874 | 1968 | CwMin | GW | St Blazey | Fowey | |
| Pinnock Hill | 0m 59y | 1845 | 1893 | D&S | NE | Shincliffe Town | end of branch | |
| Plas Dinas | ≈0m 19y | 1828 | 1867 | Nantle | Nantle | Bontnewydd | Dinas | |
| Plas Madoc | 0m 33y | by 1874 | by 1954 | GW | GW | Ruabon | Plasmadog branch | |
| Polegate | on deviation line | ≈0m 50y | 1881 | by 1909† | LBSC | LBSC | Hailsham | Polegate |
| Polhill | 1m 851y | 1868 | open | SE | SE | Knockholt | Dunton Green | |
| Polnish No 106 | 0m 38y | 1901 | open | WHE | NB | Lochailort | Beasdale | |
| Polnish No 107 | 0m 44y | 1901 | open | WHE | NB | Lochailort | Beasdale | |
| Polperro | 0m 581y | 1859 | open | Cwall | GW | Probus & Ladock | Truro | |
| Ponsbourne | 1m 924y | 1918 | open | GN | GN | Cuffley | Bayford | |
| Pontamman | possibly cut back pre-1872 | 0m 17y | 1840 | open | Llny | GW | Ammanford Colliery | Glanamman |
| Pontardawe | built 1918-1920; line never opened | 0m 103y | GW | GW | Cwmgors branch | Clydach branch | ||
| Pontarddulais | 0m 88y | 1839 | open | Llny | GW | Llangennech | Pontardulais | |
| Pontrilas | 0m 37y | 1854 | open | NA&H | GW | Pandy | Pontrilas | |
| Pont-y-Pant Lower | 0m 144y | 1879 | open | LNW | LNW | Betws-y-Coed | Pont-y-Pant | |
| Pont-y-Pant Upper | 0m 66y | 1879 | open | LNW | LNW | Betws-y-Coed | Pont-y-Pant | |
| Popham No 1 | 0m 265y | 1840 | open | LSW | LSW | Basingstoke | Micheldever | |
| Popham No 2 | 0m 199y | 1840 | open | LSW | LSW | Basingstoke | Micheldever | |
| Port Dinorwic | 0m 92y | 1843 | 1961 | Pad | Pad | Port Dinorwic | Penscoins | |
| Porthkerry No 1 | 0m 543y | 1897 | open | VoG | VoG | Barry | Rhoose | |
| Porthkerry No 2 | 0m 73y | 1897 | open | VoG | VoG | Barry | Rhoose | |
| Portobello Road | 0m 53y | 1846 | ≈2000 | NB | NB | Edinburgh Waverley | Portobello | |
| Portway No 1 | see Hotwells No 1 | |||||||
| Portway No 2 | see Hotwells No 2 | |||||||
| Possil Park | see Lochburn | |||||||
| Potters Bar (New) | west bore | 0m 1209y | 1959 | open | BR | [GN] | Hadley Wood | Potters Bar |
| Potters Bar (Old) | also called Mymms or South Mymms; east bore | 0m 1214y | 1850 | open | GN | GN | Hadley Wood | Potters Bar |
| Pottiehill | see Glenfarg North | |||||||
| Poundbury | 0m 267y | 1857 | open | GW | GW | Bradford Peveril & Stratton | Dorchester | |
| Prestbury | 0m 273y | 1845 | open | M&Bm | LNW | Adlington | Prestbury | |
| Presthope | 0m 207y | 1867 | 1963 | Wenlock | GW | Presthope | Easthope Halt | |
| Preston Brook | 0m 78y | 1837 | open | GJ | LNW | Preston Brook | Moore | |
| Preston Docks Branch | see Fishergate Hill | |||||||
| Preston Hall A | 0m 33y | 1874 | 1980s† | SM&T | LCD | East Malling | Barming | |
| Preston Hall B | 0m 54y | 1874 | 1980s† | SM&T | LCD | East Malling | Barming | |
| Primrose Hill (New) | south bore: fast line | 0m 1182y | 1879 | open | LNW | LNW | Euston | South Hampstead |
| Primrose Hill (Old) | north bore: slow line | 0m 1154y | 1837 | open | L&Bm | LNW | Euston | South Hampstead |
| Prince Of Wales | see Shildon | |||||||
| Princes Risborough | see Saunderton | |||||||
| Priory | 0m 158y | 1861 | open | LCD | LCD | Kearsney | Dover Priory | |
| Privett | 0m 1058y | 1903 | 1955 | LSW | LSW | Privett | West Meon | |
| Privett Station | 0m 55y | 1903 | 1955 | LSW | LSW | Tisted | Privett | |
| Prospect Hill | also called Crimple | 0m 825y | 1848 | 1964 | Y&NM | NE | Spofforth | Hornbeam Park |
| Prospect Hill | 0m 89y | 1895 | 1935 | MGW | MGW | Galway | Moycullen | |
| Provan Gasworks | 0m 520y | 1902 | 1962 | NB | NB | Alexandra Parade | Provan Gasworks branch | |
| Puddlebrook | see Hawthorns | |||||||
| Purton | see Severn Bridge | |||||||
| Pwllgwaun | see Graig | |||||||
| Pye Bank | see Bridgehouses |