Last update 2 December 2020
Additional information is always gratefully received, whether entirely new records (particularly historical records), or information to fill in gaps or correct errors, via the contact link under the Miscellaneous entry in the navigation bar above. Thank you.
Please follow these links for:
| Code | Line Name | Route Availability (RA) |
|---|
| GW100 | Paddington to Penzance (via Box) Replaced by GW103, GW105 and GW108 from November 1999 |
|
| GW103 | Paddington to Uffington Replaced part of GW100 from November 1999 |
8 |
| GW105 | Uffington to Fordgate (via Box) Replaced part of GW100 from November 1999 |
8 |
| GW107 | Worle Junction to Uphill Junction (via Weston-super-Mare) Replaced GW550 from November 1999 |
8 |
| GW108 | Fordgate to Penzance Replaced part of GW100 from November 1999 |
Note 1 |
| GW110 | Old Oak Common West to South Ruislip (exclusive) | 8 |
| GW117 | Greenford East Junction to Greenford South Junction | 8 |
| GW130 | Acton Wells Junction (exclusive) to Acton East | 8 |
| GW174 | West Ealing to Greenford West Junction | 8 |
| GW175 | Greenford (LUL) Bay Junction to Greenford Station | 8 |
| GW176 | Drayton Green to Hanwell Junction | 8 |
| GW178 | Southall to Brentford Goods | 8 |
| GW180 | Heathrow Airport Junction to Heathrow Terminal 4 Replaced by new GW180 from 10th April 2007 |
8 |
| GW180 | Heathrow Airport Junction to Heathrow Terminals 4 and 5 Replaced old GW180 from 10th April 2007 |
8 |
| GW182 | West Drayton to Colnbrook | 8 |
| GW184 | Slough to Windsor & Eton | 3 RA6 to 16 April 2011 |
| GW185 | Maidenhead to Marlow | 6 |
| GW187 | Twyford to Henley-on-Thames | 4 |
| GW190 | Reading Spur Junction to Reading New Junction | 8 |
| GW195 | Reading Southern Junction to Reading East Junction (Reading Low Level Line) From 6 June 2015 |
8 |
| GW200 | Didcot to Heyford (exclusive) | 8 |
| GW210 | Reading to Wokingham | ? |
| GW220 | Reading Oxford Road Junction to Reading West Junction | 8 |
| GW225 | Reading Caversham Road Junction to Oxford Road Junction (Reading Feeder Lines) | 8 |
| GW240 | Didcot East Junction to Didcot North Junction (via Avoiding Line) | 8 |
| GW250 | Foxhall Junction to Didcot West Curve Junction | 8 |
| GW254 | Appleford stone terminal branch | ? |
| GW260 | Kennington Junction to Morris Cowley | 7 |
| GW276 | Bicester Eastern Perimeter Road Level Crossing to Oxford North Junction Replaced by GW277 from 14 September 2015 |
7 |
| GW277 | Oxford North Junction to Oxford Parkway (exclusive) Replaced GW276 from 14 September 2015 |
8 |
| GW300 | Abbotswood Junction to Stoke Works Junction (via Worcester Shrub Hill) Replaced by MD900 (planned) |
8 |
| GW310 | Wolvercot Junction to Norton Junction Replaced by MD910 and new GW310 (planned) |
7 |
| GW310 | Wolvercot Junction to Pershore Replaced old GW310 (planned) |
7 |
| GW317 | Honeybourne Ground Frame to Long Marston | 7 |
| GW340 | Worcester Shrub Hill to Shelwick Junction Replaced by MD940 (planned) |
7 |
| GW350 | Worcester Tunnel Junction to Henwick Replaced by MD950 (planned) |
7 |
| GW370 | Droitwich Spa to Cutnall Green Merged into MD430 (planned) |
8 |
| GW400 | Barnt Green (exclusive) to Westerleigh Junction (via Dunhampstead) Replaced by GW401 and part of MD306 from 21 October 2017 |
8 |
| GW401 | Ashchurch (inclusive) to Westerleigh Junction Replaced GW400 from 21 October 2017 |
8 |
| GW425 | Berkeley Road Junction to Sharpness | 6 |
| GW430 | Yate Middle Junction to Tytherington Replaced by new GW430 from 24th July 2004 |
8 |
| GW430 | Yate Middle Junction (outgoing or incoming lines) to Tytherington Replaced old GW430 from 24th July 2004 |
8 |
| GW440 | Yate South Junction to Westerleigh | 8 |
| GW450 | Stoke Gifford Junction to Bristol East Junction | 8 |
| GW451 | Filton Junction to Filton West Junction (Filton Curve) | 7 RA8 to 14 January 2012 |
| GW454 | Severn Beach to Narroways Hill Junction | 7 |
| GW456 | Easton Road Junction to Barrow Road | ? |
| GW468 | South Marston Junction to Keypoint Euroterminal | ? |
| GW470 | Highworth Junction to Rover Sidings | 8 |
| GW480 | Swindon to Standish Junction | 8 |
| GW490 | Gloucester Yard Junction to Horton Road Junction | 8 |
| GW500 | Reading to Cogload Junction (via Westbury and Frome Avoiding Lines) | 8 |
| GW510 | Westbury North Junction to Bathampton Junction | 8 |
| GW520 | Westbury East Loop Junction to Hawkeridge Junction | 8 |
| GW521 | Westbury East Loop Junction to Hawkeridge Junction Believed to be listed in error |
|
| GW523 | Thingley Junction to Bradford Junction | 8 |
| GW528 | Bristol North Somerset Junction to Bristol West Junction (via St Philips Marsh) | 8 |
| GW530 | Bristol North Somerset Junction to Dr Days Junction | 8 |
| GW540 | Filton Junction to Patchway Junction | 8 |
| GW548 | Parson Street Junction to Portbury | 8 |
| GW550 | Worle Junction to Uphill Junction (via Weston-super-Mare) Replaced by GW107 November 1999 |
8 |
| GW560 | Heywood Road Junction to Fairwood Junction (via Westbury) | 8 |
| GW570 | Clink Road Junction to Blatchbridge Junction (via Frome) | 8 |
| GW572 | Frome North Junction to Whatley Quarry | 6 |
| GW580 | East Somerset Junction to Cranmore | 8 |
| GW590 | Castle Cary to 130m 00ch (Weymouth Line) | 8 |
| GW600 | Wootton Bassett Junction to Pilning Replaced GW800 from November 1999 |
8 |
| GW600 | Reading New Junction to Reading Spur Junction Believed to be listed in error |
8 |
| GW602 | Norton Fitzwarren Junction to Norton Fitzwarren WSR boundary | 8 |
| GW606 | Cowley Bridge Junction to Barnstaple | Note 2 |
| GW608 | Crediton Junction to Coleford (Meldon Line) | 6 |
| GW609 | Coleford to Meldon | 6 |
| GW610 | Crannaford Level Crossing (incl) to Exeter St Davids | 8 |
| GW611 | Exmouth Junction to Exmouth | 6 |
| GW613 | City Basin Junction to Marsh Barton | 8 |
| GW618 | Newton Abbot East Junction to Heathfield | 6 |
| GW620 | Newton Abbot West Junction to Goodrington Carriage Sidings (Paignton) | 6 |
| GW621 | Paignton to Goodrington Sidings | 6 |
| GW626 | Tavistock Junction to Marsh Mills | 8 |
| GW628 | Laira Junction to Cattewater (via Speedway Junction) Replaced by new GW628 from 22 January 2011 |
Note 3 |
| GW628 | Laira Junction/Lipson Junction to Cattewater Replaced old GW628 from 22 January 2011 |
Note 3 |
| GW629 | Laira Junction to Mount Gould Junction via Maintenance Depot | 7? |
| GW630 | Lipson Junction to Speedway Junction | 7 |
| GW637 | St Budeaux Junction to Gunnislake | Note 4 |
| GW640 | Liskeard to Looe (via Coombe) | 4 |
| GW642 | Coombe (exclusive) to Moorswater | 4 |
| GW650 | Lostwithiel to Fowey Carne Point | 6 |
| GW660 | Par to Newquay | Note 5 |
| GW661 | St Blazey to Par Harbour | 6 |
| GW672 | Burngullow to Parkandillack | Note 12 RA6 to 14 January 2012 |
| GW680 | Penwithers Junction to Falmouth | 6 |
| GW690 | St Erth to St Ives | 5 |
| GW700 | Gloucester Barnwood Junction to Severn Tunnel Junction Replaced by CY240 from 2016 |
Note 6 |
| GW704 | Wye Valley Junction to Tidenham Quarry | ? |
| GW705 | Caldicot Level Crossing Ground Frame to Sudbrook Code deleted 8 November 2008 |
6 |
| GW710 | Llanwern Works East Connection to Llanwern Works West Connection (via British Steel Service Lines) | 8 |
| GW720 | Uskmouth to East Usk Junction | 8 |
| GW730 | Sutton Bridge Junction (exclusive) to Newport Maindee West Junction Replaced by new GW730 from 4 August 2001 |
8 |
| GW730 | Shrewsbury Severn Bridge Junction to Newport Maindee West Junction Replaced old GW730 and MD820 from 4 August 2001 |
8 |
| GW731 | Abbey Foregate to Ruabon Replaced part of MD801 from 4 August 2001 |
8 |
| GW732 | Abbey Foregate to English Bridge Junction Replaced MD815 from 4 August 2001 |
8 |
| GW733 | Sutton Bridge Junction to Aberystwyth Replaced MD825 from 4 August 2001 |
Note 7 |
| GW734 | Dovey Junction to Pwllheli Replaced MD830 from 4 August 2001 |
5 |
| GW735 | Shrewsbury Crewe Junction to Nantwich Replaced MD835 from 4 August 2001 |
8 |
| GW736 | Gobowen South to Llanddu Junction Replaced MD840 from 4 August 2001 |
5 |
| GW740 | Maindee East Junction to Maindee North Junction | 8 |
| GW750 | Hereford Brecon Curve Ground Frame to MEB Siding | 8 |
| GW770 | Ebbw Vale South Ground Frame to Gaer Junction (Western Valley Line) Replaced by new GW770 from 30 November 2007 |
8 |
| GW770 | Ebbw Vale Parkway to Gaer Junction (Western Valley Line) Replaced old GW770 from 30 November 2007; replaced by new GW770 from 10 May 2015 |
5 RA8 to 25 April 2009 |
| GW770 | Ebbw Vale Town to Gaer Junction (Western Valley Line) Replaced old GW770 from 10 May 2015 |
5 |
| GW773 | Machen Quarry to Park Junction | 6 |
| GW780 | Ebbw Junction to Park Junction | 8 |
| GW784 | Alexandra Dock Junction to 160m 27ch (boundary with ABP Newport Docks) | 8 |
| GW790 | Pengam Junction to 4m 54ch (boundary with ABP Cardiff Docks) Replaced by new GW790 from 29 June 2015 |
7 |
| GW790 | Pengam Junction to Tidal Sidings Replaced old GW790 from 29 June 2015 |
7 |
| GW800 | Wootton Bassett Junction to Pilning Replaced by GW600 November 1999 |
8 |
| GW810 | Rhymney to Queen Street North Junction | 6 |
| GW819 | Penrhiwfelin Ground Frame to Ystrad Mynach North Line disconnected by 19 December 2007: unclear whether code deleted at same time |
? |
| GW820 | Cwmbargoed to Ystrad Mynach South | 8 |
| GW828 | Coryton to Heath Junction | 6 |
| GW830 | Merthyr Tydfil to Barry Island (via Cardiff Queen Street) | Note 8 |
| GW834 | Hirwaun to Abercynon | 6 |
| GW835 | Treherbert to Pontypridd Junction | 6 |
| GW839 | Queen Street South Junction to Cardiff Bay | 6 |
| GW840 | Radyr Junction to Cardiff Radyr Branch Junction (via City Lines) | 8 |
| GW850 | Leckwith Loop South Junction to North Junction | 8 |
| GW860 | Penarth Curve North Junction to Penarth Curve South Junction | 8 |
| GW864 | Cogan Junction to Penarth | 6 |
| GW870 | Barry to Bridgend Barry Junction (Vale of Glamorgan Line) | 8 |
| GW871 | Ford's Junction to Waterton | 8 |
| GW873 | Llantrisant East Ground Frame to Cwm Llantwit | ? |
| GW874 | Bridgend Llynfi Junction to Llynfi Replaced by new GW874 by 2016 |
6 |
| GW874 | Bridgend Llynfi Junction to Maesteg Replaced old GW874 by 2016 |
6 |
| GW875 | Tondu to Pontycymmer | ? |
| GW877 | Tondu to Port Talbot Docks (Ogmore Vale Extension) | 6 |
| GW878 | Newlands Loop Junction to Newlands Junction | 8 |
| GW887 | Margam Yard Junction to Margam Middle Junction | 8 |
| GW888 | Margam Moors Junction to Margam Abbey Works East Junction | 8 |
| GW890 | Court Sart Junction/Up Flying Loop Junction to Morlais Junction | 8 |
| GW892 | Jersey Marine Junction South to Glyn Neath | 6 |
| GW893 | Onllwyn to Neath & Brecon Junction | 6 |
| GW894 | Jersey Marine Junction North to Jersey Marine Junction South | 8 |
| GW897 | Grovesend Colliery Loop Junction to Hendy Junction | 6 RA8 to 14 January 2012 |
| GW900 | Pilning to Fishguard Harbour | Note 9 |
| GW906 | Swansea Loop East Junction to Swansea Loop West Junction | 7 |
| GW910 | Craven Arms to Llandeilo Junction (Central Wales Line) | Note 10 |
| GW915 | Gwaun-Cae-Gurwen to Pantyffynnon | 5 |
| GW923 | Cwmmawr to Kidwelly | 8 presumed |
| GW930 | Carmarthen Junction to Carmarthen Station | 8 |
| GW940 | Carmarthen Station to Carmarthen Bridge Junction | 8 |
| GW950 | Whitland to Pembroke Dock Replaced by CY1540 from 2012 |
Note 11 |
| GW960 | Clarbeston Road to Milford Haven | 8 |
| GW970 | Gulf Oil Branch Junction to Waterston Gulf Oil Refinery | 8 |
| GW980 | Herbrandston Junction to Robeston Amoco Sidings | 8 |
| GW990 | Trecwn to Letterston Junction | ? |
| GW1000 | All Lines | n/a |
| GW4501 | Stoke Gifford Junction to Bristol Bulk Handling Terminal | 7 |
| GW5001 | Beechgrove Ground Frame (incl) to Westbury North Junction | 8 |
| GW5401 | Filton West Junction to Patchway Junction (Patchway Chord) | 7 or 8 conflicting information |
| GW6135 | Exeter Railway Junction to Alphington Road | ? |
| GW8001 | Long Dyke Junction to 0m 33ch (boundary with ASW Castle Works) | ? |
| GW8901 | Jersey Marine Junction South to Jersey Marine | 6 |
| GW9001 | Landore Junction to Swansea | 7 |