Rail passengers across Britain face disruption due to a fault with a radio system used by train drivers and signallers.
Train information website National Rail Enquiries said trains “across the network” are having to start their journeys later because of the failure of the onboard GSM-R system, and “may be subject to cancellations or alterations”.
Elizabeth line trains serving Reading and Heathrow airport are affected.
ScotRail passengers are being permitted to travel via “any reasonable route” because of the issue.
The failure with the GSM-R system “is currently being investigated”, National Rail Enquiries said.
