Lichfield passengers are being warned of potential delays on the West Coast Main Line as temperatures continue to soar.
London Northwestern Railway say journeys to and from Euston and the north west could be affected.
The company say expected trackside temperatures in excess of 50°C will see Network Rail impose blanket speed restrictions on parts of the network in an attempt to prevent rails from buckling.
It means that fewer trains than usual will be able to run in some areas.
Jonny Wiseman, customer experience director for London Northwestern Railway, said: “Extreme heat causes issues on the track and we are taking sensible precautions with our service in order to keep the railway moving. Passengers should check their journeys before travelling.
“It is crucial that passengers remain hydrated and we advise our customers to carry water with them if possible.
“If passengers feel ill on board a train they should not attempt to stop it, but instead seek help at the next station.”
Passengers who are delayed on their journeys as a result of the extreme heat are encouraged to claim compensation via the Delay Repay scheme.