Last update 7 November 2008
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Introduction A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Lines without codes London Underground system
Phil Deaves, Swindon, Wiltshire
I am always grateful for additional information, whether entirely new records (particularly historical records), or information to fill in gaps or correct errors, via the email address above. Thank you.
| Code | Line Name | Mileages | Datum | Notes |
|---|---|---|---|---|
| SAA | Stirling and Alloa Branch | -0.01 - 6.58 | Stirling Middle Junction | |
| SAB | Lawton Junction to Sandbach Branch | 0.00 - 6.40 | Lawton Junction | |
| SAC | Settle and Carlisle Line | 234.44 - 307.12 | St Pancras | |
| SAD | Somerset and Dorset Line (Bath to Templecombe) | 0.00 - 36.47 | Bath Junction | |
| SAE | Sandy Gate Branch (Burry Port to Llanelly) | 0.00 - 3.67 | Burry Port Dock Junction | Formerly SAN |
| SAG | St Andrews Junction to Grand Junction Curve (Birmingham) | 0.00 - 0.52 | St Andrew's Junction | |
| SAH | St Albans to Hatfield Line | 17.76 - 23.76 | King's Cross | = HSS Starts at Hatfield |
| SAI | Salford Incline (Oldfield Road Junction to Salford Goods) | 0.00 - 0.44 | Oldfield Road Junction | |
| SAJ | Stalybridge Junction and Guide Bridge West Junction Spur | 0.04 - 2.08 | Guide Bridge West Junction | |
| SAL | Salisbury Branch (Westbury to Wilton) | 110.04 - 134.27 | Paddington via Melksham | 132.33 - 134.27 now 85.37 - 83.43 ex Waterloo on BAE2 |
| SAM | Broom and Byfield Line | now SJT | ||
| SAM | Shropshire and Montgomeryshire Light Railway | 0.00 - 18.01 | Shrewsbury Abbey | |
| SAN | Sandy Gate Branch (Burry Port to Llanelly) | now SAE | ||
| SAN | Santon Slag Sidings (Scunthorpe) | 0.00 - 1.70 | Foreign Ore Branch Junction | |
| SAR | South Acton to Richmond Line | see separate portions | ||
| SAR1 | South Acton Junction to Gunnersbury Junction | 2.52 - 3.12 | West London Junction | |
| SAR2 | Gunnersbury Junction to Richmond | 9.76 - 12.39 | Waterloo via Kensington Junction and Turnham Green | |
| SAS | Stechford and Aston Line | -0.30 - 2.61 | Stechford North Junction | |
| SAT | Saltmarket Branch | 0.36 - 0.52 | Sydney Street Junction | |
| SAU | St Austell Goods Branch | 0.00 - 0.19 | St Austell Junction | |
| SAW | Severn and Wye Line (Lydney) | 0.00 - 18.60 | Berkeley Road Junction | |
| SBA | Shrewsbury and Aberystwyth Line | see separate portions | ||
| SBA1 | Sutton Bridge Junction to Welshpool (part Shrewsbury & Welshpool Line) | 0.00 - 16.19 | Sutton Bridge Junction | Now also marked in km from Sutton Bridge Junction |
| SBA2 | Welshpool to Aberystwyth (part of Whitchurch & Aberystwyth Line) | 31.21 - 95.60 | Whitchurch via Oswestry | Now also marked in km from Sutton Bridge Junction |
| SBB | Salford Ship Canal to Windsor Bridge Junction Branch | 0.00 - 1.07 | Windsor Bridge Junction | |
| SBC | Stainton Branch | 0.00 - 1.56 | Stainton Branch Junction, Dalton | Furness Railway route |
| SBE | St Catherine's Junction to Black Carr East Junction (Doncaster) | 0.00 - 0.55 | St Catherine's Junction | |
| SBF | Shipley and Bradford Forster Square Branch | 205.54 - 208.55 | St Pancras via Cudworth | |
| SBH | Springs Branch (Wigan) and Huyton Line | see separate portions | ||
| SBH1 | Huyton Junction to St Helens Station Junction | -0.15 - 5.12 | Huyton Junction | |
| SBH2 | St Helens Station Junction to Gerards Bridge Junction | 5.12 - 5.66 | Huyton Junction | |
| SBH3 | Gerards Bridge Junction to Springs Branch Junction | 5.66 - 12.54 | Huyton Junction | |
| SBH4 | Ince Moss Sidings | 11.06 - 12.71 | Huyton Junction | |
| SBJ | St Budeaux Junction | now SBX | ||
| SBJ | Swanley to B Junction (Ashford) via Maidstone East Line | 17.37 - 59.07 | Victoria via Herne Hill | |
| SBK | Sudbrook Branch | see separate portions | ||
| SBK1 | Sudbrook Branch | 146.71 - 147.02 | Paddington via Stroud | |
| SBK2 | Sudbrook Branch | 0.00 - 1.24 | Sudbrook Branch Junction | |
| SBL | Siddick Junction to Buckhill Branch | see separate portions | ||
| SBL1 | Calva to Siddick Junction | 10.06 - 11.27 | Cleator Moor | |
| SBL2 | Calva to Buckhill | 0.07 - 6.20 | Calva Junction | To Burnhill 3.35, Linefoot Junction 6.20 |
| SBM | Sandal Branch | 0.00 - 0.56 | Sandal Junction | Sandal Junction to West Riding Junction (Oakenshaw Junction), GN&GC Joint route |
| SBO | Borders Rail Link | ?? | ?? | Listed as 0.00 - 0.05 |
| SBR | Shepreth Branch (Hitchin to Cambridge) | 32.11 - 55.26 | King's Cross | |
| SBS | Sudbury Sidings | 58.25 - 58.44 | Liverpool Street via Marks Tey Junction (reverse) | |
| SBT | Sudbury and Thetford Line | 58.34 - ~90.08 | Liverpool Street via Marks Tey Junction (reverse) | |
| SBX | St Budeaux Junction | 249.79 - 250.15/227.07 - 227.23 | Paddington via Box and Plymouth Millbay (reverse)/Waterloo | Formerly SBJ. Now counted as part of DAC |
| SBY | South Bishopley Branch | 0.00 - 1.33 | Bishopley Junction | |
| SCA | Dunston to Sheepbridge Branch | see separate portions | ||
| SCA1 | Dunston and Barlow North Junction to Whittington Road Junction | 0.00 - 0.21 | Dunston & Barlow North Junction | Near Chesterfield, continuation of SHE |
| SCA2 | Whittington Road Junction to Sheepbridge Branch | 0.01 - 0.43 | ?? | Near Chesterfield, continuation of SHE |
| SCB | Sutton Colliery Branch | 140.34 - 142.11 | St Pancras via Toton | Listed to 141.74 |
| SCC | Sheepcote Curve (West London Junction to Latchmere No. 3 Junction) | 3.19 - 3.56 | Waterloo | |
| SCD | Scunthorpe Trent Junction to Dawes Lane Junction Branch | 0.00 - 0.28 | Trent Junction | |
| SCG | South Carlisle Goods Lines (Bog Junction to Forks Junction) | 0.29 - 0.44 | Currock Junction | |
| SCH | Swadlincote to Cadley Hill Colliery Line | see separate portions | ||
| SCH1 | Woodville Goods Junction to Swadlincote Junction | 122.61 - 128.29 | St Pancras via Leicester, Coalville and Woodville | |
| SCH2 | 126.29 to Swadlincote Junction | 126.29 - 128.28 | St Pancras via Leicester, Coalville and Woodville | |
| SCJ | South Cobbinshaw Branch | 0.65 - 1.43 | Tarbrax Junction | South Cobbinshaw Junction to South Cobbinshaw, off Tarbrax Branch between Auchengray and Cobbinshaw |
| SCL | Soho Curve (Soho North Junction to East Junction) | 0.00 - 0.22 | Soho East Junction | |
| SCM | Scottish Central Main Line (Dundee to Motherwell via Stirling) | see separate portions | ||
| SCM1 | Motherwell to Mossend South Junction | 89.50 - 91.08 | Carlisle (direct) | |
| SCM2 | Mossend South Junction to Whifflet North Junction | 91.03 - 94.05 | Carlisle via Ravenscraig No 1 | |
| SCM3 | Whifflet North Junction to Dunblane | 94.05 - 123.40 | Carlisle via Ravenscraig No 1 | |
| SCM4 | Dunblane to Perth St Leonards | 123.40 - 150.61 | Carlisle via Ravenscraig No 1 | |
| SCM5 | Dundee Central Junction to Perth St Leonards | 0.35 - 21.23 | Dundee West | |
| SCN | Weaste Branch (Eccles) | -0.05 - 0.70 + depot | Eccles Station Junction | |
| SCO | Seaforth Connecting Line (Seaforth South Junction to Rimrose Road) | 0.00 - 0.37 | Seaforth South Junction | |
| SCP | Sydenham to Crystal Palace Line | 6.41 - 7.61 | London Bridge | |
| SCQ | Calstock Quay Branch | Code used in error. See CSQ for correct code | ||
| SCQ | Stoke-On-Trent to Caldon Low Branch (Waterhouses Branch) | see separate portions | ||
| SCQ1 | Stoke Junction to Congleton | -0.22 - 3.51 | Original Stoke Junction | Stoke Junction to Milton Junction |
| SCQ2 | Milton Junction to Leek Brook Junction | 0.00 - 6.65 | Milton Junction | |
| SCQ3 | Leek Brook Junction to Caldon Low | -0.02 - 8.60 | Leek Brook Junction | |
| SCR | Speke Junction and Church Road Junction (Garston) Branch | 22.28 - 24.60 + port | Timperley Junction via Arpley Junction and Ditton Junction | |
| SCT | Seaforth Container Terminal Branch (from Bootle Branch Junction) | see separate portions | ||
| SCT1 | Bootle Branch Junction to Canada Dock Goods | 0.14 - 5.18 | Bootle Branch Junction | |
| SCT2 | Atlantic Dock Junction to Alexandra Dock Goods | 4.49 - 5.57 | Bootle Branch Junction | |
| SCU | South Croydon to Uckfield Branch | see separate portions | ||
| SCU1 | South Croydon to Uckfield | 11.29 - 46.14 | London Bridge | |
| SCU2 | Lewes to Uckfield | 8.00 - 16.37 | Brighton | |
| SCW | Scarborough Gallows Close Goods | 0.00 - 0.45 | Falsgrave Box, Scarborough | |
| SCY | Summit Colliery Branch | 0.00 - 0.37 | Summit Colliery Box | Great Northern Leen Valley Extension route |
| SCZ | Somerset Coal Canal | 0.00 - 6.61 | ?? | Canal only, no track. CMZ built on route of canal |
| SDA | Dafen Branch/St Davids Branch (Llanelly) | 0.00 - 2.53/225.11 - 227.64 | St Davids Junction/Paddington via Stroud | |
| SDB | Strathord to Bankfoot Branch | 0.00 - 3.05 | Strathord Junction | |
| SDC | Stratford Central Junction West to Coppermill North Junction Loop | 3.76 - 7.13 | Liverpool Street | |
| SDD | Sheerness Dockyard Line | 50.48 - 50.78 | Victoria via Herne Hill | |
| SDG | Snodgrass Branch | 0.00 - 0.40 | Bogside | |
| SDG0 | St Albans Down Siding (TOPS 63201) | 19.52 - 19.65 | St Pancras | |
| SDH | Shelford to Haverhill via Bartlow Line | 0.00 - ~14.70 | Shelford Junction | |
| SDI | Swansea District Line | 0.00 - 10.64 | Skewen East Junction | Now SDI2 |
| SDI | Swansea District Line | see separate portions | ||
| SDI1 | Briton Ferry Up Flying Loop Junction | 206.14 - 208.49 | Paddington via Stroud | Ex RSB? |
| SDI2 | Mileage change to Morlais | 0.00 - 10.64 | Skewen East Junction | Formerly SDI |
| SDI3 | Skewen East Junction to Lonlas Junction | 0.00 - 1.08 | Skewen East Junction | |
| SDJ | Skelton Junction to Ditton Junction Line | see separate portions | ||
| SDJ1 | Broadheath Junction to Skelton West Junction | 0.00 - 0.39 | Broadheath Junction | |
| SDJ2 | Timperley Junction to Ditton No 1 Junction | 0.00 - 18.55 | Timperley Junction | |
| SDK | St Dunstans N&E to Keighley Line | 191.63 - 204.61 | King's Cross via Birkenshaw Line | From St Dunstan's East Junction, St Dunstan's North Junction 0.00 to St Dunstan's West 0.11 |
| SDL | Shieldhall Branch | 0.00 - 0.60 | Cardonald North Junction | |
| SDM | Scotswood to Durham via Consett Line | 0.00 - 24.49 | Relly Mill Junction | |
| SDP | Swindon Loco Depot and Stores | 77.06 - 77.51 | Paddington | |
| SDP | St Denys to Portcreek Junction Line | see separate portions | ||
| SDP1 | St Denys to Fareham | 1.45 - 14.15 | Southampton Terminus | |
| SDP2 | Fareham to Portcreek Junction | 84.09 - 91.02 | Waterloo via Eastleigh | |
| SDS | St Dennis Branch | 288.05 - 295.61 | Paddington via Box and Plymouth Millbay (reverse) | |
| SDT | Shoreditch Depot | 0.00 - 0.09 | Dunloe Street Box | LNW Goods off North London Railway |
| SDY | Grahamston Station Junction to Springfield Yard | 0.00 - 0.30 | Grahamston Station Junction | |
| SDZ | St Dennis Branch (abandoned portion, prior to Carpella Deviation [SDS]) | 289.72 - 290.65 | Paddington via Box and Plymouth Millbay (reverse) | |
| SEA | Seaton Branch | now SEB | ||
| SEA | Dawdon Junction to Seabanks | see separate portions | ||
| SEA1 | Seabanks Branch | 0.65 - 1.65 | Hawthorn Box | Dawdon Mine to Dawdon Junction |
| SEA2 | Seabanks Branch | 0.00 - 0.65 | Hawthorn Box | Hawthorn Junction to Dawdon Mine |
| SEB | Seaton Branch | 0.00 - 4.31 | Seaton Junction | Formerly SEA |
| SEC | Selby Canal Goods Curve (Selby West Junction to Canal Junction) | 0.00 - 0.33 | Selby West Junction | |
| SED | Senghenydd Branch | 9.16 - 12.50 + colliery | Cardiff East Dock | Formerly SEN |
| SEJ | Swansea East Junction Line | now SWT | ||
| SEJ | Sheerness Branch (Sittingbourne Eastern Junction) | see separate portions | ||
| SEJ1 | Sittingbourne Eastern Junction to Middle Junction | 0.00 - 0.23 | Sittingbourne Eastern Junction | |
| SEJ2 | Sittingbourne Middle Junction to Sheerness-on-Sea | 44.13 - 51.19 | Victoria via Herne Hill | |
| SEK | East Dock Line (Swansea) | 47.69 - 48.09/0.00 - 0.20 | Taff Vale Extension Junction/East Dock Line Junction | Formerly SEL |
| SEL | East Dock Line (Swansea) | now SEK | ||
| SEL | Shepcote Lane West Junction to Tinsley South Junction Curve | 161.25 - 161.63 | St Pancras via Leicester, Toton and Treeton | |
| SEN | Senghenydd Branch | now SED | ||
| SEN | Syston East Junction to Syston North Junction Curve | 0.00 - 0.17 | Syston North Junction | |
| SEP | South Elmsall Loop | 0.00 - 1.21 | Moorthorpe North Junction | Moorthorpe North Junction to South Elmsall Junction, Swinton & Knottingley Joint |
| SER1 | Felixstowe Branch Junction to Network Rail boundary | 83.57 - 84.75 | Liverpool Street | |
| Code not in GEOGIS: existance in doubt | ||||
| SES | Seal Sands Branch (Billingham) | 0.00 - 2.43 | Seal Sands Branch Junction | |
| SEU | Seaton to Uppingham Branch | 0.00 - 3.14 | Seaton | |
| SEX | Salford Approach to Exchange Station | 0.00 - 1.00 | n/a | Road only |
| SEY | Seymour Colliery Branch (Barrow Hill) | 151.77 - 152.30 | St Pancras via Leicester and Toton | |
| SFA | St Fagans Branch | 0.00 - 1.09 | St Fagans Branch Junction | |
| SFB | Stockingford Branch | 0.00 - 2.63 | Stockingford Branch Junction | |
| SFC | Sheffield City Goods Branch | 0.10 - 0.41 | Woodburn | |
| SFD | Seafield Branch | ?? | ?? | South Leith |
| SFI | Shawfield Branch | 0.00 - 1.19 | Law Junction | |
| SFK | Shawfield Fork | 0.00 - 0.32 | Shawhill Junction | Solway Junction to Shawhill Junction, Annan |
| SFL | Stockton Freightliner Terminal Branch | 60.50 - 61.45 | Leeds Wortley Junction via Harrogate Starbeck and Northallerton Low Level | |
| SFO | Stansfield Hall Fork | 19.30 - 19.54 | Manchester Victoria | Todmorden - Stansfield Hall curve |
| SFQ | Stud Farm Quarry Branch | 0.00 - 1.24 | Bagworth Colliery Branch Junction | |
| SFY | Stratton Factory Branch | now SNY | ||
| SFY | Spitalfields Yards | 0.00 - 0.28 | Spitalfields Goods Junction | |
| SFZ | Severn and Wye Futterhill Branch | 14.33 - 14.54 | Berkeley Road Junction | |
| SGB | Saltney Goods Branch | 0.00 - 1.10 | Saltney Dee Junction | |
| SGC | Stretford Gasworks Siding | 0.00 - 0.20 | Branch Junction | Cornbrook CLC |
| SGL | Sighthill Yard Junction to Sighthill Freight Terminal Junction Line | 102.79 - 103.06 | Carlisle via Whifflet | |
| SGN | Springburn Line (Belgrove to Cowlairs West Junction) | -0.01 - 2.60 | Cowlairs West Junction | |
| SGS | Salthouse Junction to Barrow Factory Line | 0.00 - 0.13 | Salthouse Junction | |
| SGW | Stafford Gas Works Line | 12.43 - 12.63 | Bromshall Junction | |
| SGZ | Saltash to St Germans Line | 252.22 - 255.41 | Paddington via Box and Plymouth Millbay (reverse) | |
| SHA | Shawhead Branch | ?? | ?? | |
| SHB | Sheffield and Barnsley Line | 161.52 - 173.48 | St Pancras via Leicester, Toton and Sheffield | |
| SHC | Shirebrook Colliery Branch | 144.07 - 144.68 | St Pancras via Corby and Newstead | Originally from 144.11 |
| SHD | Sheepford Branch | see separate portions | ||
| SHD1 | Whifflet Ground Frame to Headshunt | 9.11 - 9.46 | High Street Glasgow | |
| SHD2 | Sheepford Branch Junction to Sheepford Coal Concentration Depot | 0.00 - 0.31 | Sheepford Branch Junction | = part SHP ?? |
| SHE | Sheepbridge Branch | 147.33 - 150.67 | St Pancras | |
| SHF | Strawberry Hill to Fulwell Curve | 12.28 - 12.56 | Waterloo via Twickenham | |
| SHG | Sherburn Curve (Sherburn Junction to Gascoigne Wood Junction) | 13.19 - 14.34 | York | |
| SHI | Shipley Branch | 190.00 - 196.05 | King's Cross | Cutlers North Junction to Shipley Windhill |
| SHL | Shrewsbury and Hereford Line | 0.00 - 52.19 | Shrewsbury | 51.15 - 52.19 formerly 144.05 - 143.02 ex Paddington in GCT |
| SHN | St Helens Line | 0.00 - 0.22 | Branch Junction | Siding alongside canal |
| SHO | Shobnall Branch | see separate portions | ||
| SHO1 | Shobnall Junction with Midland Railway to Stretton Junction with North Stafford Railway | 0.00 - 1.15 | Shobnall Junction | Original mileage 0.00 - 2.04 |
| SHO2 | Shobnall Branch | 127.22 - 127.32 | St Pancras | Nominally from Leicester Junction Burton on Trent 127.00 to Shobnall Wharf 127.47 |
| SHP | Sheepford Branch | 0.00 - ?? | Sheepford Branch Junction | |
| SHR | Shieldmuir (Wishaw) Connecting Line | 86.62 - 87.43 | Carlisle via Wishaw | |
| SHS | St Helens Line (formerly to Widnes) | see separate portions | ||
| SHS1 | Sutton Oak Junction to St Helens Station Junction | 5.57 - 7.16 | Widnes | |
| SHS2 | Sutton Oak Junction to St Helens Junction (goods lines) | 0.00 - 0.37 | Sutton Oak Junction | See also SSO |
| SHU | Shoeburyness Sidings | 38.74 - 39.?? | Fenchurch Street | |
| SHW | Shireoaks West Junction to Woodend Junction Curve | 153.71 - 154.36 | St Pancras via Corby and Newstead | |
| SHZ | Speech House Hill Branch | 15.20 - 15.76 | Berkeley Road Junction | |
| SIA | Sutton in Ashfield Branch | 0.00 - 0.60 | Sutton Junction South | |
| SIB | St Ives Branch | see separate portions | ||
| SIB1 | Chesterton to Fen Drayton | 57.55 - 68.44 | Liverpool Street via Clapton | |
| SIB2 | Fen Drayton to Huntingdon via St Ives | 68.44 - 69.18 | Liverpool Street via Clapton | |
| SIC | Silverwood Colliery Branch (Rotherham) | see separate portions | ||
| SIC1 | Silverwood Colliery Headshunt to 11MP | 10.39 - 11.00 | Brancliffe East Junction | |
| SIC2 | 11MP to Thrybergh Junction | 11.00 - 13.11 | Brancliffe East Junction | |
| SID | Sidmouth Branch | 159.20 - 167.39 | Waterloo via Feniton (reverse) | |
| SIE | St Ives to Ely (Sutton) Branch | 0.00 - 16.70 | St Ives | |
| SIG | Sighthill Branch | 0.00 - 1.22 | Cowlairs West Junction | |
| SIL | Stock Interchange Line (Liverpool Central) | 0.16 - 0.31 | Mann Island Junction | Also listed as 0.31 - 0.46 |
| SIM | Simpasture Branch | ?? | ?? | County Durham |
| SIN | Singer Branch | 0.00 - 0.24 | Singer Station Box | Branch to Singer Works |
| SIR | Sirhowy Line | 0.00 - 15.39 | Nantybwch Junction | |
| SIV | St Ives Branch | 320.77 - 325.21 | Paddington via Box, Plymouth Millbay (reverse) and St Erth (reverse) | |
| SIZ | Sizewell Power Station Branch (Saxmundham) | 91.40 - 95.79 | Liverpool Street | |
| SJA | Southfield Junction to Alton Heights Line | 9.27 - 14.77 | Lesmahagow Junction, Motherwell | |
| SJB | St James Goods Junction to Bridge Junction (Doncaster) | 22.35 - 22.54 | Penistone via Barnsley GC and Wath | |
| SJC | Wennington to Carnforth Furness and Midland Junction | 0.02 - 9.45 | Carnforth Furness and Midland Junction | |
| SJD | Skelton Junction and Deansgate Junction Curve (Navigation Road) | 0.00 - 0.33 | Skelton Junction | |
| SJF | Stanley Junction to Forfar Line | 158.38 - 184.26 | Carlisle via Ravenscraig No 1 | = part KAS |
| SJG | St Johns Junction to Gallowgate Junction Line | 0.00 - 0.25 | St John's Junction | |
| SJL | Stalybridge Junction to Dukinfield Line | see separate portions | ||
| SJL1 | Dukinfield to Stalybridge Junction | 0.00 - 1.60 | Dukinfield Junction | End on junction with DJD |
| SJL2 | Stalybridge Junction to Stalybridge Joint Station | 1.71 - 2.33 | Dukinfield Junction | |
| SJM | Swinton Junction to Mexborough Line | see separate portions | ||
| SJM1 | Swinton South Jn to former Swinton Junction | 166.56 - 167.18 | St Pancras via Leicester and Toton | |
| SJM2 | Mexborough North Junction to former Swinton Junction | 15.04 - 15.64 | Penistone Barnsley Junction via Mexborough (reverse) | |
| SJN | Standish Junction Line | ?? | ?? | Standish Junction - Whelley Junction, Wigan |
| SJO | Sandhills Junction and Ormskirk Line | see separate portions | ||
| SJO1 | Walton Junction to Sandhills Junction | 33.16 - 34.75 | Manchester Victoria | |
| SJO2 | Walton Junction to Ormskirk | 3.20 - 12.15 | Liverpool Exchange | |
| SJR | Stockport Junction Railway (Davenport Junction to Cheadle Village Junction) | 0.00 - 0.73 | Davenport Junction | |
| SJS | Stourbridge Junction to Stourbridge Town Branch | 142.20 - 143.35 | Paddington via Didcot and Charlbury | Includes Stourbridge Goods Branch |
| SJT | Stratford-On-Avon Station Junction to Towcester Branch/Broom & Byfield Line/Blisworth Stratford-on-Avon and Broom Line | see separate portions | Formerly SAM | |
| SJT1 | Blisworth to Broom North Junction | 0.00 - 45.49 | Blisworth | |
| SJT2 | Towcester to Cockley Brake | 0.00 - 10.70 | Towcester | |
| SJT3 | Towcester to Ravenstone Wood Junction | 0.00 - 10.42 | Towcester Olney Line Junction | |
| SJU | Seacombe Junction to Seacombe Station | 4.73 - 7.18 | Mann Island Junction via Moorfields | |
| SKA | Skellow Junction to Adwick Junction Curve (South Elmsall) | -0.08 - 0.62 | Adwick Junction | |
| SKB | South Kirkby Colliery Branch (South Elmsall) | 165.40 - 166.40 | King's Cross | |
| SKC | Skelmanthorpe Colliery Branch (Clayton West Junction to Clayton West) | 7.67 - 11.22 | Huddersfield | |
| SKD | Swansea Kings Dock Junction to South Dock | 0.00 - 2.47 | Burrows Junction (Kings Dock) | |
| SKE | Skelmersdale Branch (Rainford Junction to Ormskirk) | 24.33 - 30.31 | Manchester Victoria | |
| SKI | Skipton to Ilkley Branch | 211.23 - 220.64 | St Pancras | |
| SKK | Selkirk Branch | 34.41 - 39.55 | Edinburgh Waverley | Selkirk Junction to Selkirk |
| SKL | Stocksbridge Light Railway | 0.00 - 2.07 | Deepcar GC station | |
| SKM | South Kirkby Junction to Moorthorpe Junction Curve | 0.05 - 0.56 | South Kirkby Junction | |
| SKN | St Andrews Junction to Kings Norton Line | 40.48 - 47.02 | Derby via Camp Hill line | 40.48 - 41.18 now LSS |
| SKS | Skipton Middle Junction to Grassington/Skipton & Swinden | see separate portions | ||
| SKS1 | Skipton Station North Junction to Embsay Junction | 220.64 - 222.68 | St Pancras via Ilkley | |
| SKS2 | Embsay Junction to Grassington | 0.00 - 8.38 | Embsay Junction | |
| SKW | Skipton and Wennington Line | see separate portions | ||
| SKW1 | Skipton to Wennington Junction | 221.68 - 249.44 | St Pancras via Cudworth and Keighley | |
| SKW2 | Wennington Junction to Morecambe | 249.44 - 263.15 | St Pancras via Cudworth and Keighley | |
| SLB | Severn and Wye Lydbrook Branch | 16.33 - 20.69 | Berkeley Road Junction via Serridge Junction (reverse) | |
| SLC | Stewarts Lane Sidings | see separate portions | ||
| SLC1 | Non-electrified roads | 1.52 - 1.60 | Victoria | |
| SLC2 | Not allocated | n/a | n/a | |
| SLC3 | Not allocated | n/a | n/a | |
| SLC4 | Not allocated | n/a | n/a | |
| SLC5 | Not allocated | n/a | n/a | |
| SLC6 | Not allocated | n/a | n/a | |
| SLC7 | Not allocated | n/a | n/a | |
| SLC8 | Carriage Depot roads 1 to 22 | 1.41 - 1.68 | Victoria | Formerly SLC |
| SLC9 | Non-electrified roads | 1.52 - 1.60 | Victoria | = SLC1 ?? |
| SLD | Stainland Branch | 30.77 - 32.55 | Manchester Victoria | |
| SLE | St Leonards Branch | 0.00 - 1.57 | Duddingston Junction | |
| SLH | Silloth Branch | 0.00 - 21.25 | Carlisle Canal Junction | |
| SLJ | Slow Lines Junctions (Streatham North to South Junctions) | 6.06 - 6.38 | Victoria | |
| SLL | St Lukes Junction to Pool Hey Junction Line | 32.51 - 37.35 | Manchester Victoria | Southport |
| SLN | Standish Junction Line | 0.00 - 1.20 | Whelley Junction | = SJN ?? |
| SLO | Slough West Curve | 0.00 - 0.19 | Slough West Junction | |
| SLP | Shotton Loop | 13.25 - 14.35 | Wrexham Central | |
| SLR | Seafield Branch | ?? | ?? | |
| SLS | Swinlees Branch | 0.00 - 1.59 | Swinlees Branch Junction | Between Glengarnock and Dalry; 0.00 - 0.28 still in use to Roche Products as ZZA3 |
| SLT | Stonebridge Park LUL Depot | 7.07 - 7.13 | Euston | |
| SLZ | Stratford-on-Avon to Longdon Road | ?? - ?? | ?? | Horse tramway |
| SMA | South Manchester Airport Chord | 1.10 - 1.48 | Manchester International Airport Station | |
| SMB | St Margarets to Buntingford Branch | 21.27 - 31.68 | Liverpool Street | |
| SMC | Smithywood Colliery Branch (Rotherham) | 2.22 - 6.38 | Attercliffe Junction | |
| SME | Smeaton to Monktonhall Junction Line | 6.21 - 7.58 | Edinburgh Waverley | |
| SMF | Smyllum Fork | 0.00 - 0.22 | Smyllum West Junction | Assuming Smyllum West Junction to Lanark Racecourse Junction Possibly Smyllum East Junction to Lanark Racecourse Junction 1.63 - 2.00 from Lanark Junction, Cleghorn |
| SMI | South Wales Mineral Railway | 0.00 - 13.03 | Briton Ferry | 0.00 - 0.76 now 18.30 - 17.34 ?? in BJZ |
| SMJ | South Wales Mineral Junction Branch | now SWJ | ||
| SMJ | Swinton and Milford Junction Line | see separate portions | ||
| SMJ1 | Swinton Junction to Dearne Junction | 166.59 - 168.64 | St Pancras via Leicester and Toton | |
| SMJ2 | Dearne Junction to Burton Salmon | 0.00 - 17.15 | Burton Salmon | |
| SMJ3 | Burton Salmon to Milford Junction | 15.04 - 16.69 | York | |
| SML | Stonehouse and Merryton Junction Line | 3.29 - 7.52 | Lesmahagow Junction, Motherwell | |
| SMM | Smeaton to Macmerry Branch | 7.58 - ?? | Edinburgh Waverley | |
| SMN | Slammanan Branch (Airdrie to Manuel Junction via Slammanan) | 8.75 - 26.49 | High Street, Glasgow | Greenside Junction, Kipps - Manuel Junction, Bo'ness Junction |
| SMP | Stratford Motive Power Depot | 0.00 - 0.59 ?? | Channelsea North Junction | |
| SMS | Greenhill Lower Junction to Larbert Junction Line | 106.60 - 109.43 | Carlisle via Ravenscraig No 1 | |
| SMS | Streatham Moredon and Sutton Line | see separate portions | ||
| SMS1 | Streatham to Wimbledon | 0.00 - 3.05 | Streatham South Junction | |
| SMS2 | Wimbledon to Sutton | 7.20 - 12.50 | Waterloo | |
| SMW | Smithywood Colliery Branch | 0.15 - 0.48 | Ecclesfield East | Tinsley Junction to Chapeltown GC Line |
| SMY | Mayfield Low Level Goods Branch | 188.36 - 188.58 | Euston | = MAY ?? |
| SNA | Snape Branch | 0.00 - 1.32 | Snape Junction | |
| SNB | Swansea North Dock Branch | now SND | ||
| SNB | Swainby Branch | 0.00 - 2.04 | Junction near Potto Junction | |
| SNC | Stavely Works New Curve | 149.40 - 149.49 | St Pancras | = Staveley ?? |
| SND | Swansea North Dock Branch | 215.64 - 216.42 | Paddington via Stroud | Formerly SNB |
| SNF | Selhurst to Norwood Fork Junction Line | 9.33 - 9.64??/9.37 - 9.68 | London Bridge/Victoria | |
| SNJ | Sandbach and Northwich West Junction Branch | -0.07 - 8.64 | Sandbach North Junction | |
| SNK | Swansea Docks | see separate portions | ||
| SNK1 | Burrows Junction to King's Dock | 0.12 - 0.78 | Burrows Junction | |
| SNK2 | Prince of Wales Dock | 0.22 - 1.34 | Burrows Junction | |
| SNK3 | Swansea Docks Dragon Shipping | 0.15 - 0.34 | Burrows Junction | |
| SNK4 | Swansea Docks A & B Sheds | 1.08 - 1.29 | Burrows Junction | |
| SNL | Stanton Branch | 137.26 - 139.73 | King's Cross | |
| SNO | Snydale No 1 Branch | 183.09 - 186.68 | St Pancras | |
| SNS | Streatham North to South Junctions Curve | 6.16 - 6.42 | Victoria | |
| SNT | Swindon Transfer Yard | 76.13 - 77.12 | Paddington | |
| SNW | Sleaford North Junction to West Junction Loop | 1.34 - 3.42 | Sleaford South Junction | |
| SNX | Stanton Branch Extension | 138.60 - 139.56 | King's Cross | |
| SNY | Stratton Factory Branch | 2.10 - 2.48/0.00 - 0.38 | Highworth Junction/Kingsdown Road Junction | Formerly SFY |
| SOB | Severn and Wye Oakwood Branch | now SOD | ||
| SOB | Soham Branch (Ely Dock Junction to Chippenham Junction) | see separate portions | ||
| SOB1 | Chippenham Junction to Snailwell Junction | 0.00 - 0.63 | Snailwell Junction | |
| SOB2 | Snailwell Junction to Ely Dock Junction | 1.54 - 12.33 | Newmarket Old Station | |
| SOB3 | Chippenham Old Curve to Snailwell Junction | 0.00 - 1.54 | Newmarket Old Station | |
| SOC | Shireoaks Colliery Branch | 154.15 - 154.36 | St Pancras | |
| SOD | Severn and Wye Oakwood Branch | 10.54 - 11.45 | Berkeley Road Junction | Formerly SOB |
| SOE | Souterhouse Branch | 0.00 - 0.67 | Souterhouse Branch Junction | Whifflet, North British Railway route |
| SOG | South Side Goods | 100.67 - 101.19 | Carlisle | Gushetfaulds |
| SOH | South Leith Branch | 0.00 - 2.66 | Portobello Junction | |
| SOL | South Lynn Branch (King's Lynn) | 35.27 - 36.17 | Peterborough Wisbech Junction | |
| SOM | Sutton Oak Junction to Widnes Old Junction Line | 0.00 - 5.57 | Widnes canal bridge, 0.07 south of Widnes No 4 Box | |
| SOP | Soho Pool Branch | 0.00 - 0.56 | Soho Pool Junction, Soho Road | |
| SOR | Somersham to Ramsay Branch | 0.00 - 4.20 | Somersham Junction | |
| SOS | Stourport on Severn Branch | 132.15 - 134.57 | Paddington via Didcot and Charlbury | = Part SVB |
| SOT | Seaton-On-Tees Branch (Seaton Carew) | 0.00 - 1.51 | Seaton Snook Junction | |
| SOU | Southport and Preston Line (Hawkshead Street Junction to Whitehouse West Junction) | 0.76 - 14.70 | Southport | |
| SOW | Solway Branch | 16.60 - 21.00 | Kirtlebridge | Abbey Junction to Brayton |
| SOY | Southampton Eastern Docks Branch | 78.09 - 79.02 + docks | Waterloo | |
| SPA | Manchester Piccadilly Station Approach | 0.00 - 0.10 | n/a | Road only |
| SPB | Sproxton Branch | 4.37 - 7.69 | High Dyke Junction | Skillington Road Junction - Sproxton |
| SPC | Sheepbridge Canal Branch | 0.00 - 0.32 | Canal Branch Junction | |
| SPC | St Pancras to Chesterfield Line | see separate portions | ||
| SPC1 | St Pancras to Bedford | 0.00 - 50.00 | St Pancras | |
| SPC2 | Bedford to Wellingborough | 50.00 - 64.78 | St Pancras | See also WYM |
| SPC3 | Wellingborough to Wigston South Junction | 64.78 - 95.38 | St Pancras | |
| SPC4 | Wigston South Junction to Leicester | 95.38 - 98.74 | St Pancras | |
| SPC5 | Leicester to Ratcliffe Junction | 98.74 - 118.60 | St Pancras | |
| SPC6 | Ratcliffe Junction to Derby | 118.60 - 128.30 | St Pancras | |
| SPC7 | Spondon to Derby London Road Junction | 126.27 - 128.23 | St Pancras | |
| SPC8 | Derby London Road Junction to Clay Cross South Junction | 127.54 - 147.69 | St Pancras | |
| SPC9 | Clay Cross South Junction to Tapton Junction | 142.10 - 146.59 | St Pancras via Leicester and Toton | |
| SPD | Spalding and Doncaster Line | see separate portions | ||
| SPD1 | Spalding Winsover Road Junction to Sleaford South Junction | 44.07 - 62.13 | Huntingdon South Junction via March | |
| SPD2 | Sleaford South Junction to Greetwell Junction | 62.13 - 81.25 | Huntingdon South Junction via March | |
| SPD3 | Greetwell Junction to Gainsborough Trent Junction | 81.25 - 98.55 | Huntingdon South Junction via March | 98.55 - 98.69 is MAC3 |
| SPD4 | Gainsborough Trent West Junction to Bessacarr | 98.69 - 115.72 | Huntingdon South Junction via March | 98.55 - 98.69 is MAC3 |
| SPD5 | Bessacarr to Decoy North Junction | 115.72 - 117.40 | Huntingdon South Junction via March | |
| SPE | Spiersbridge Branch | 3.78 - 4.74 | Gorbals Junction | Branch from Kennishead, Barrhead & Kilmarnock Joint |
| SPF | Spean Bridge to Fort Augustus Branch | 0.00 - 24.07 | Spean Bridge | |
| SPG | Severn and Wye Parkend Goods Branch | 12.18 - 12.44 | Berkeley Road Junction | |
| SPH | Springs Branch | 0.11 - 2.54 | Springs Branch Junction | |
| SPI | Spilsby Branch | 0.00 - 4.14 | Spilsby Line Junction, Firsby | |
| SPJ | Six Pit Junction/Swansea Valley Junction with Midland | 213.26 - 213.68/0.00 - 0.42 | Paddington via Stroud/Swansea Valley Junction | |
| SPK | Springbank Branch | 0.00 - 1.17 | Springbank Quarry Junction, Clarkston (Lanark) | |
| SPL | Springwell Branch | 149.32 - 150.36 | St Pancras | |
| SPN | Spinners End Goods Branch | 0.00 - 0.65 | Corngreaves Junction | |
| SPO | Stonehouse Pool Branch (Plymouth) | 0.00 - 0.76 + harbour | Stonehouse Pool Junction | |
| SPR | Staveley Works Curve | 149.40 - 149.45 | St Pancras | = SNC ?? |
| SPS | Sculcoates Power Station Branch | 0.00 - 0.34 | Sculcoates Box | Hull & Barnsley route, north side of line |
| SPV | Stooperdale Curve | 0.00 - 0.27 | Charity Junction | |
| SPW | Springbank Junction to Walton St Junction Curve | 1.29 - 1.54 | Hull | |
| SPY | Springhead Yard (Hull) | see separate portions | ||
| SPY1 | Springhead Yard (Hull) | 0.19 - 0.45 | Springbank North Junction | Former Springhead Goods Loop, 0.19 is Springhead West Junction, line continued parallel with H&B main line joining at Locomotive Junction 1.02 |
| SPY2 | Springhead Yard (Hull) | 2.25 - 2.44 | Hull Neptune Street | Springhead South Junction to Springhead West Junction |
| There were several lines in this area: It is not certain which codes apply to the "missing" parts. |
SRD | St Helens and Rainford Line | 7.69 - 12.58 | Huyton Junction |
| SRM | St Rollox and Milton Line | 102.00 - 103.44 | Carlisle | Milton Junction to St Rollox station |
| SRS | Stonebridge Park Shop Sidings | ?? | ?? | = BFG ?? |
| SRY | St Rollox Yard (BRML) | ?? | ?? | = ZZA9 ?? |
| SRZ | Stapleton Road Goods Branch | 1.00 - 1.75 | Bristol Temple Meads | Or ~1.59 - 2.02 ?? |
| SSB | Severn and Wye Sling Branch | 15.50 - 16.28 | Berkeley Road Junction via Coleford Junction (reverse) and Milkwall Junction (reverse) | |
| SSC | Streatham to Streatham Common Curve | 7.57 - 8.10 | London Bridge | |
| SSD | Stockton to Sunderland Line | 0.00 - 4.02/0.34 - 21.31 | Bowesfield Junction, Stockton/Redmarshall East Junction | Bowesfield Junction to Redmarshall North Junction and Redmarshall North Junction to Ryhope Grange Junction |
| SSE | Sleaford South Junction to East Junction Curve | 0.00 - 0.43 | Seaford South Junction | |
| SSG | Sculcoates Goods Branch (H&BR) | 0.00 - 0.25 | Sculcoates Junction | See also SPS |
| SSH | South Dock High Level Line | now SSZ | ||
| SSH | Scunthorpe Yard | ?? - ?? | ?? | |
| SSJ | Sheet Stores Junction to Stenson Branch (Castle Donnington) | see separate portions | ||
| SSJ1 | Sheet Stores Junction to Chellaston East Junction | 119.62 - 127.27 | St Pancras | |
| SSJ2 | Chellaston West Junction to Stenson Junction | 127.77 - 132.12 | St Pancras | |
| SSK | Saltburn and Skinningrove Branch | see separate portions | ||
| SSK1 | Saltburn West Junction to Skinningrove (Cleveland Potash) | 27.02 - 34.33 | Darlington | |
| SSK2 | Skinningrove to Whitby Bog Hall Junction | 34.33 - 51.71 | Darlington | |
| SSL | South Dock Low Level Line | now SSY | ||
| SSL | Seven Sisters Loop | 0.00 - 0.13 | Seven Sisters Junction | |
| SSM | Stanton and Shipley Branch and Extension (Mapperley Branch) | 127.19 - 129.53 | St Pancras | |
| SSN | Sharpness Dock North Branch | 4.24 - 5.02 + docks | Berkeley Road Junction via North Dock Junction (reverse) | |
| SSO | Sutton Oak Junction to St Helens Junction (Passenger Lines) | 0.00 - 0.36 | Sutton Oak Junction | See also SHS2 |
| SSP | Soho South to Perry Barr South Junction Branch | 0.00 - 2.75 | Perry Barr South Junction | |
| SSR | St Enoch and Shields Road Line | 0.00 - 1.31 | St Enoch | Part remiled to form part HST |
| SSS | Sharpness Dock South Branch | 3.44 - 4.17 | Berkeley Road Junction | |
| SSV | Shenfield and Southend Victoria Line | 20.22 - 41.42 | Liverpool Street | |
| SSW | Stratford Western Junction to Stratford Southern Junction Line | 3.59 - 3.78 | Liverpool Street | |
| SSY | South Dock Low Level Line | 0.00 - 0.25 + docks | Branch Junction | Formerly SSL |
| SSZ | South Dock High Level Line | 0.00 - 0.09 + docks | Branch Junction | Formerly SSH |
| STA | Staines Branch | 13.28 - 19.39 | Paddington | 13.28 - 13.39 formerly UXB |
| STB | St Botolphs Branch (East Gate Junction to St Botolphs Station) | 53.14 - 53.76 | Liverpool Street | St Botolphs now Colchaster Town |
| STC | Stairfoot East Junction to Cudworth Station Junction Line | 172.27 - 174.77 | St Pancras | |
| STD | Stratford Branch | 0.00 - 18.12 | Honeybourne Junction | 7.15 - 18.12 now HSA |
| STE | Stoneycombe Branch | 0.00 - 0.25 | Stoneycombe Junction | Formerly STY |
| STF | Norton-On-Tees South Junction to Ferryhill South Junction Branch | 0.00 - 10.72 | Norton-On-Tees South Junction | |
| STG | Stoke Goods Lines (Crewe Sorting Sidings South to Crewe South) | 7.70 - 8.67 | Kidsgrove Junction | To 8.32 ?? |
| STH | Stanmore to Harrow and Wealdstone Line | 0.00 - 2.11 | Harrow and Wealdstone | |
| STI | Swannington Incline | 113.03 - 114.21 | St Pancras | |
| STJ | Whitehouse West Junction to Whitehouse East Junction Line | 14.77 - 15.23 | Southport | South of Preston |
| STK | Stank Branch | 0.00 - 1.74 | Salthouse Junction, Barrow | |
| STL | Sighthill East Junction to Sighthill Freight Terminal | 102.66 - 103.12 | Carlisle via Whifflet | = SIG ?? Now part ZZA9 ?? |
| STM | Stratford Temple Mills Yard | 4.50 - 5.76 | Liverpool Street via Stratford | |
| STN | Stranraer Town Branch | 53.05 - 53.40 | Castle Douglas No 2 Signal Box | |
| STO | Stoke Branch | 126.20 - 130.27 | Paddington via Didcot and Charlbury | |
| STR | Stroud Branch | now STW | ||
| STR | Stranraer Line | see separate portions | ||
| STR1 | Ayr to Girvan | 40.49 - 61.60 | Bridge Street Junction | |
| STR2 | Girvan to Challoch | 0.00 - 30.60 | Girvan Junction | |
| STR3 | Challoch to Stranraer Harbour Junction | 46.54 - 53.05 | Castle Douglas No 2 Signal Box | |
| STR4 | Stranraer Harbour Junction to Stranraer | 53.05 - 54.19 | Castle Douglas No 2 Signal Box | |
| STS | Seaford Branch | 51.11 - 58.78 | London Bridge via Redhill | |
| STT | Silvertown Yard | 6.00 - 8.00 | Liverpool Street via Stratford, Silvertown (reverse) | |
| STW | Stroud Branch | 104.11 - 105.34 | Derby | Formerly STR |
| STY | Stoneycombe Branch | now STE | ||
| STY | Styal Line (Wilmslow Junction to Slade Lane Junction) | -0.05 - 9.44 | Wilmslow Junction | |
| STZ | Stover Canal | 0.00 - 2.57 | End of Canal | Canal only, no track. Datum from which end ?? |
| SUB | Edinburgh Suburban Line | see separate portions | ||
| SUB1 | Portobello Road Junction to Lothian Lines Junction | 3.30 - 4.00 | Edinburgh Waverley | |
| SUB2 | Haymarket Central Junction to Lothian Lines Junction | 0.10 - 6.69 | Haymarket Central Junction | |
| SUC | Salt Union Company's Siding | 0.00 - 0.18 | Junction 0.25 down Winsford Junction to Over & Wharton Branch | |
| SUD | Sudbury Branch | 46.53 - 58.36 | Liverpool Street via Marks Tey Junction (reverse) | |
| SUT | Sutton Harbour Branch | see separate portions | ||
| SUT1 | Laira Junction to Speedway Junction (new route avoiding HST depot) | 243.67 - 244.45 | Paddington via Box | |
| SUT2 | Mount Gould Junction to Sutton Harbour | 244.41 - 245.60 | Paddington via Box | |
| SUX | Stafford to Uttoxeter Line | 0.00 - 12.60 | Bromshall Junction | |
| SVB | Severn Valley Branch | 132.15 - 171.59 | Paddington via Didcot and Charlbury | Part now in MJI; includes SOS |
| SVE | Strathaven Branch | 0.00 - 10.17 | Strathaven Junction, Hamilton | Strathaven Junction to Strathaven North first station |
| SVL | Swansea Vale Line | 0.00 - 18.23 | Swansea St Thomas Station | |
| SVN | Strathavon Branch | 0.00 - 1.26 | Strathavon Branch Junction | Serves Strathavon and Jawcraig Collieries, between Slamannan and Avonbridge, North British Railway route |
| SVS | Severnside Branch | 11.64 - 12.66 + sidings | Bristol Temple Meads via Pilning | |
| SWA | Swansea High Street Branch | 214.63 - 216.08 | Paddington via Stroud | |
| SWB | South Wales and Bristol Direct Line | 83.07 - 112.76 | Paddington | |
| SWC | Swalwell Colliery Branch (Dunston) | 0.00 - 0.44 | Swalwell Junction | Listed to 0.23 |
| SWD | Seaton to Wansford Branch | 31.50 - 43.27 | Rugby | |
| SWE | Staines to Windsor and Eton Riverside Branch | 19.06 - 25.48 | Waterloo via Twickenham | |
| SWG | Shawsrigg Branch | 0.00 - 0.40 | Shawsrigg Branch Junction | Between Dalserf and Stonehouse, Caledonian Railway route |
| SWH | Swanwick Branch | 0.00 - 0.76 + private | Swanwick Branch Junction | |
| SWI | Wimberry Branch | now WIY | ||
| SWI | Swinehill Branch | 0.00 - 0.72 | Swinehill Box | Serves Swinehill Collieries, between Dalserf and Stonehouse, Caledonian Railway route |
| SWJ | South Wales Mineral Junction Branch | 0.00 - 5.55 | Tonygroes North Junction | Formerly SMJ |
| SWK | Shardlow Works Branch | 0.00 - ?? | Meadowhall | At Meadowhall (Sheffield). Records include bridge at 0.04 |
| SWL | Swansea Loop/Landore Western Loop | 0.00 - 0.53 | Swansea Loop West Junction | |
| SWM | South Wales Main Line | see separate portions | ||
| SWM1 | Swindon to Gloucester Yard Junction | 77.20 - 113.03 | Paddington via Stroud | 106.67 - 112.02 now 99.74 - 94.60 ex Derby in BGL2; 112.02 - 113.03 now 94.10 - 93.09 ex Derby in BGL1 |
| SWM2 | Gloucester Yard Junction to Johnston | 113.03 - 285.26 + docks | Paddington via Stroud | |
| SWN | Swansea Line | 0.00 - 12.35 | Pontarddulais Junction | |
| SWO | Halesworth to Southwold Line | 0.00 - 9.56 | Halesworth | |
| SWP | Shirebrook Junction to Warsop Junction Curve | 0.00 - 0.45 | Warsop Junction | |
| SWR | Cardiff East Branch | 0.00 - 0.66 | East Branch Junction | Formerly CEZ |
| SWS | Shildon Works | 0.00 - 0.49 | Shildon Station | Formerly went to 1.19 |
| SWT | Swansea East Junction Line | 48.07 - 48.43 | Taff Vale Extension Junction | Formerly SEJ |
| SWW | Swinton West Curve | 0.00 - 0.39 | Mexborough Junction | |
| SWX | Staines West Link Line | 19.52 - 19.69 | Waterloo via Twickenham | |
| SWY | Stert and Westbury Line | 81.01 - 95.36 | Paddington via Newbury | |
| SYB | Saxby to Bourne Line | 0.00 - 8.00 | Bourne Line Junction, Saxby | |
| SYC | Shrewsbury and Crewe Line | -0.05 - 32.30 | Crewe South Junction | |
| SYD | Stoneywood Branch | 0.00 - 0.78 | Denny | Near Larbert |
| SYE | Sunnyside Loop (Sunnyside Junction to Whifflet South Junction) | 8.43 - 9.65 | High Street | |
| SYS | Saxby to Sutton Bridge Line | 8.00 - 18.01 | Bourne Line Junction, Saxby | It would appear M&GN was remiled from Bourne continuing from Saxby to Spalding Junction at 25.65 |
| SZS | Willesden South West Sidings | 6.23 - 6.50 | Euston | |
Introduction A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Lines without codes London Underground system