Rail passengers told to travel only if essential as heatwave disrupts services

Britain’s rail network is facing major disruption as a rare red extreme-heat warning covers Wednesday and Thursday, with Network Rail telling passengers in the warning zone to travel only if their journey is absolutely essential.

The Met Office warning, first reported on Monday and confirmed again as the situation developed, covers much of the period when temperatures are expected to rise above 37C and could reach 40C in some places. Rail operators and infrastructure managers have moved to reduce speeds, cut timetables and warn passengers that services may not run as normal.

What has been announced

Network Rail said it will impose speed restrictions to protect tracks and equipment in the heat. That is expected to slow trains and cause significant delays and cancellations across affected routes.

The Guardian reported that no rail replacement bus services will be provided during the disruption period, adding to the difficulty for passengers whose services are cancelled or altered at short notice.

Chiltern Railways has already cancelled more than half of its normal timetable. The operator is telling passengers to avoid travelling if possible and to check their journeys on the morning of travel.

LNER has also warned customers not to travel on Wednesday or Thursday if they can avoid it, while offering ticket flexibility for affected days.

Why the heat is disrupting trains

Extreme heat is a known risk for rail infrastructure. Steel rails expand as temperatures rise and can buckle, while overhead wires and signalling equipment are also more vulnerable to overheating.

The safety measures now being used are intended to reduce the risk of infrastructure failures, but they also make journeys slower and less reliable at the height of the heatwave.

Who is affected

The disruption is being described as affecting services across Britain, especially long-distance routes from London and other mainlines in the red-warning area.

Commuters and intercity passengers are likely to face delays, cancellations and altered timetables over both days, with the biggest impact expected during the hottest part of the spell.

What happens next

More operators may issue their own advice or cancellations before Wednesday, and Network Rail could tighten speed restrictions further if temperatures rise again.

Passengers will also be watching for how quickly services recover after Thursday and whether any additional ticket flexibility or service-restoration measures are announced for Friday.

For now, the advice from rail managers is clear: avoid non-essential travel where possible and expect disruption while the heat persists.