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
| ELR | Route | Section | Remarks |
|---|---|---|---|
| WAC | Warsop Colliery Branch (Shirebrook) | Understood to be disused | |
| WAG1 | Wakefield to Goole | Wakefield Kirkgate West Jn to Engine Shed Jn | |
| WAG2 | Wakefield to Goole | Engine Shed Jn to Potters Grange Jn | |
| WAG3 | Wakefield to Goole | Engine Shed Jn to Mineral Junction (Goole Docks) | Understood to be disused |
| WAH | Worcester and Hereford Line | Shrub Hill Jn to Shelwick Jn | |
| WAR | Appleby North Jn to Appleby West Jn | ||
| WAT | Waterside Branch | Dalrymple Jn to Chalmerston | |
| WAW | Willesden Low Level Goods Jn to Acton Wells Jn | ||
| WBB | Wycombe Branch | Maidenhead to Bourne End | Understood to be part closed |
| WBC | West Burton Power Station Sidings | Understood to be part closed | |
| WBH | Westgate Branch | Holmes Jn to CF Booth Scrapyard (NR boundary) | Known anomalies with data source accuracy |
| WBK | Welbeck Coal Loading Point | Understood to be disused | |
| WBS1 | Windsor Bridge Jn to Southport | Windsor Bridge Jn to Crow Nest Jn | |
| WBS2 | Windsor Bridge Jn to Southport | Crow Nest Jn to Wigan Wallgate Jn | |
| WBS3 | Windsor Bridge Jn to Southport | Wigan Wallgate Jn to Southport (via Meols Cop) | |
| WBT | Willesden Brent Sidings | Sidings 1-15 | |
| WCG | Croxley Green Branch | Watford High Street to Croxley Green Jn | Understood to be disused |
| WCI | Wilton ICI Branch | Shell Jn to ICI Wilton | |
| WCK | Far North Line | Inverness to Wick | |
| WCL | Willesden to Willesden Carriage Shed North | Carriage Lines | |
| WCM1 | West Coast Main Line (WCML) | Carlisle to Law Jn | |
| WCM2 | West Coast Main Line (WCML) | Law Jn to Glasgow Central | |
| WCS | Selhurst Jn to Gloucester Road Jn Curve | ||
| WDB1 | Wrexham Central to former Dee Marsh West Jn | Wrexham Central to Hawarden Bridge | |
| WDB2 | Wrexham Central to former Dee Marsh West Jn | Hawarden Bridge to Dee Marsh West Jn | |
| WDB3 | Wrexham Central to former Dee Marsh West Jn | former Dee Marsh West Jn to Bidston Dee Jn | |
| WDJ | Darlaston Curve | Pleck Jn to Darlaston Jn | |
| WDS | Selsdon Branch | Woodside to Selsdon | Understood to be disused |
| WDU | Werrington Dive-Under | Marholm Jn to Glinton Jn | |
| WEB | Werrington Branch | Werrington Jn to former Spalding South Jn | |
| WEC1 | Langwith Jn (Open) | Understood to be disused | |
| WEE | Winwick to Earlestown East Curve | Winwick Jn to Earlstown East Jn | |
| WEF1 | Wembley European Freight Operating Centre | ||
| WEL1 | West Ealing Loop | West Ealing Jn to Greenford West Jn | |
| WEL2 | West Ealing Loop | Greenford West Jn to Greenford | |
| WES | Westbury Avoiding Line | Heywood Road Jn to Fairwood Jn (via Westbury Avoider) | |
| WEY | Weymouth Branch | Thingley to Dorchester Jn (via Frome and Yeovil) | |
| WFL | Willesden Freightliner Depot | ||
| WGL | Wednesbury Goods Loop (or Bescot Curve) | Bescot Curve Jn to Bescot Jn | Understood to be disused |
| WGP | Wigston South (or Birmingham) Curve | Wigston South Jn to Glen Parva Jn | |
| WHC1 | Whitlingham Jn to Cromer | Whitlingham Jn to former Roughton Road Jn | |
| WHC2 | Whitlingham Jn to Cromer | former Roughton Road Jn to former Runton East Jn | |
| WHC3 | Whitlingham Jn to Cromer | former Runton East Jn to Cromer Jn | |
| WHL | West Highland Line | Craigendoran Jn to Fort William | |
| WHM | West Hallam Colliery Branch | Stanton Gate to West Hallam Colliery | |
| WHR | Whiskerhill Jn to Retford Curve | Whiskerhill Jn to Retford Jn | |
| WIG | Wisbech Goods Line | March East Jn to Wisbech | Understood to be disused |
| WIN | Windsor Branch | Slough to Windsor & Eton Central | |
| WIS | Wickford Jn to Southminster | ||
| WJB | Willingdon Jn to Bopeep Jn | ||
| WJK | Mersey Northern Line | Kirkby to Walton Jn | |
| WJL1 | Weaver Jn to Liverpool Lime Street (Runcorn Branch) | Weaver Jn to Ditton No. 1 Jn | |
| WJL2 | Weaver Jn to Liverpool Lime Street | Ditton No. 1 Jn to Speke Jn | |
| WJL3 | Weaver Jn to Liverpool Lime Street | Speke Jn to Edge Hill Jn | |
| WJL4 | Weaver Jn to Liverpool Lime Street | Edge Hill Jn to Liverpool Lime Street | |
| WJP1 | Glazebrook to Godley Line | Glazebrook East Jn to Woodley Jn | Understood to be part closed |
| WKC | Welbeck Colliery Branch | former Welbeck Colliery Jn to Welbeck Colliery | |
| WKG8 | Woking Yard Sidings | Down Side | |
| WKG9 | Woking Yard Sidings | Up Side | |
| WKL1 | Wigan and Kirkby Line | Wigan Wallgate Jn to former Pemberton Jn | |
| WKL2 | Wigan and Kirkby Line | former Pemberton Jn to Kirkby | |
| WLL | West London Line | Falcon Jn to Willesden West London Jn | |
| WLL9 | North Pole Channel Tunnel Carriage Servicing Depot | ||
| WLN | Dunstable Branch | Welwyn Garden City to Dunstable | Understood to be part closed |
| WMB | Mitre Bridge Curve | Willesden High Level Jn to Mitre Bridge Jn | |
| WMD1 | Willesden Traction Maintenance Depot Sidings | ||
| WME | Roundwood Chord | Woodburn Jn to Mexborough East Jn | |
| WMS | Sittingbourne Curve | Sittingbourne Western Jn to Middle Jn | |
| WMY | Whitemoor Yard Sidings | ||
| WND | Wellington (Donnington Jn) to Stafford | Understood to be operational at Wellington end only | |
| WNS | South Leicestershire Line | Wigston North Jn to Nuneaton South Jn | |
| WOA1 | Arpley Jn to Warrington South Jn | Arpley Jn to Walton Old Jn | Walton (or Arpley) Branch |
| WOA2 | Arpley Jn to Warrington South Jn | Gridiron South Jn to Gridiron North Jn | Arpley Sidings |
| WOA3 | Arpley Jn to Warrington South Jn | Gridiron Feeding Jn to Warrington South Jn | Arpley Feeding Line |
| WOA4 | Arpley Jn to Warrington South Jn | Arpley Holding Sidings | |
| WOP | Water Orton to Park Lane Curve | Water Orton West Jn to Park Lane Jn | |
| WOW1 | Wolverton Centre Sidings | ||
| WOW2 | Wolverton Works Reception Sidings | ||
| WPH1 | Woking Jn to Havant Jn | ||
| WPH2 | Havant Jn to Portsmouth Harbour | ||
| WPK | Wimbledon Park and East Depot Sidings | ||
| WPS | former Poulton-le-Fylde Jn to Wyre Power Station | Understood to be disused | |
| WQL | Whatley Quarry Lines | Hapsford Jn to Whatley Quarry NR boundary | |
| WRG | Whitehall Road Goods Siding | ||
| WRM | Willesden Royal Mail Terminal | ||
| WRO | Waterloo Branch | Kittybrewster Jn to Aberdeen Waterloo Terminal (NR boundary) | |
| WSA | St Albans Abbey Branch | Watford Yard GF to St Albans Abbey | |
| WSB | West Sleekburn Jn to North Blyth | ||
| WSJ1 | Wolverhampton to Chester (Saltney Jn) Line | Wolverhampton North Jn to Stafford Road Jn | |
| WSJ2 | Wolverhampton to Chester (Saltney Jn) Line | Stafford Road Jn to Saltney Jn | |
| WSM | Weston-super-Mare Loop | Worle Jn to Uphill Jn | |
| WTB | West Blyth Staithes Branch | Blyth Staithes Jn to Blyth West Staithes | Understood to be disused |
| WTH | West Norwood Spur | Tulse Hill Jn to West Norwood Jn | |
| WTQ | Weymouth Quay Branch | Weymouth Tramway Jn to Weymouth Quay | Understood to be disused |
| WTS | Willesden Through Sidings | ||
| WTZ | Taunton West Loop | Understood to be disused | |
| WVL | Western Valleys Line | near Park Jn to former Aberbeeg Jn | |
| WWD | Wishaw Deviation Line | Law Jn to Holytown Jn | |
| WWK | Wakefield Westgate Curve | Wakefield Kirkgate Ings Jn to Wakefield West Riding Jn | |
| WYE | Wye Valley Branch | Wye Valley Jn to Tidenham | Understood to be disused |
| WYL | Westbury East Loop | Hawkeridge Jn to Westbury East Loop Jn | |
| WYM | Wymington Deviation | Sharnbrook to Irchester | |
| WYS | Wemyss Bay Branch | Wemyss Bay Jn to Wemyss Bay |