125 Group Avanti West Coast Bluebell Railway Bo'ness and Kinneil Railway Caledonian Sleeper Chiltern Railways Colas Rail CrossCountry DB Cargo (EWS) DC Rail Direct Rail Services (DRS) ESH Rail East Lancashire Railway (ELR) East Midlands Railway Elizabeth Line Eurostar Ffestiniog & Welsh Highland Railways Freightliner GB Railfreight Gatwick Express Grand Central Great Northern Great Western Railway Greater Anglia Heathrow Express Heavy Haul Rail Hull Trains Island Line Keighley & Worth Valley Railway (KWVR) Llanelli & Mynydd Mawr Railway Locomotive Services Ltd London North Eastern Railway London Northwestern Railway London Overground Lumo Merseyrail Network Rail North Yorkshire Moors Railway (NYMR) Northern ROMIC Rail Operations Group RailAdventure ScotRail Severn Valley Railway (SVR) South Western Railway South Yorkshire Future Tram Southeastern Southern Swanage Railway Thameslink TransPennine Express Transport for Wales Tyne and Wear Metro West Coast Railways West Midlands Railway West Somerset Railway c2c