Related: Passengers are escorted off broken-down train during intense heatwave
Train services across England are operating under speed restrictions due to extreme heat, with track temperatures expected to reach 50C.
The high temperatures cause steel rails to expand, risking buckling, which necessitates slower train speeds to ensure safety.
Key affected routes include the Brighton Main Line, services west of London Paddington, and lines between East Croydon and Burgess Hill.
Passengers should anticipate delays of 10 to 20 minutes, longer journey times, and potential cancellations, with restrictions in place until at least Tuesday evening.
Network Rail advises travellers to check services before departure, consider working from home if possible, and carry water during their journeys.