A “nationwide fault” is impacting railway services this morning – causing misery for commuters. National Rail said the issue relates to the communication system used between train drivers and signallers.A spokesman said: “Trains across the network are having to start their journeys later because of this fault and some may also be subject to cancellations or alterations.”Commuters are being advised to check ahead before they travel throughout the morning. Commuters have been left stranded this morning (file pic)PAServices between Reading / Heathrow Airport and Reading on the Elizabeth Line are also impacted by this incident. Meanwhile, Scotrail is advising commuters with valid tickets to travel “via any reasonable route.”South Western Railway, Gatwick Express, Great Northern, Southern, Southeastern and Thameslink services are all currently impacted.It said the issue appears to be a fault with the onboard GSMR radio system, which is used to communicate in case of emergencies.One commuter at London Victoria station told GB News: “[Delays] have been happening more often but I don’t know if that’s due to the weather or strike action.”LATEST DEVELOPMENTSPassengers are delayed this morning (file pic)PAAnother commuter said: “It seems to be happening a lot, but I’m not sure if it’s more than it used to be or if it’s the same as before. I am late to work sometimes.”Meanwhile, a tree in the Outwood area fell onto the railway and caused damage to the overhead wires between Leeds and Wakefield Westgate. Network Rail have removed the tree and made some repairs the overheads so trains are safe to coast through the area.However, more safety checks are required before the lines can reopen, there is currently no estimate of when the lines will reopen at present.As a result, trains may be cancelled, delayed by up to 60 minutes, diverted or revised. Major disruption is expected until the end of the day on CrossCountry routes between Edinburgh and Birmingham New Street / Bristol Temple Meads / Plymouth, and between Leeds and Plymouth, and also between Newcastle and Reading.LNER lines between Skipton, Bradford Forster Square, Harrogate, Leeds and London Kings Cross are being impacted as well as Northern routes between Leeds and Knottingley, Doncaster and Sheffield.Journeys in and out of major transport hubs, including London Paddington and Victoria, have been impacted by today’s delays.