Commuters have been advised to avoid travelling on key rail routes in London and the south-east on Thursday as record temperatures threaten to cause tracks to buckle.
Train companies operating services into London from Kent, Sussex, Cambridge and other commuter-belt counties said they would be running fewer trains and imposing speed restrictions. They warned passengers to avoid travelling if possible. LNER, operator of the London-to-Scotland east coast line, also advised customers against travelling.
Network Rail said in hot weather tracks can be 20C hotter than the surrounding air temperature, causing the steel rails to expand and buckle under pressure from trains. Tracks are less likely to buckle if trains run more slowly, it said.
Southeastern Trains, which operates services into London from Kent and East Sussex, said it would run significantly fewer services on Thursday to let trains travel more slowly.
As a result, many trains will be much busier than usual and journeys will take longer, Southeastern said. “We strongly advise you to avoid travelling, if you can.”
Southern Trains, which runs routes from Brighton, Cambridge and Gatwick airport into London also warned of delays and advised passengers not to travel. The Gatwick Express, Great Northern, Southern and Thameslink services will all be affected, it said.
Greater Anglia said it would run fewer trains from London Liverpool Street to Norfolk, Suffolk and Essex on Thursday and advised customers to check services before travelling. Services from the Midlands, the north and other regions into London may also be affected.
The south-east is forecast to be the hottest part of the country as the heatwave reaches its peak with temperatures in London set to hit a record 37C. Rail companies from across the UK were meeting on Wednesday afternoon to agree reductions to the next day’s services.
Transport for London, which operates the London underground and overground rail services, said journeys may take longer than usual on Thursday because of speed restrictions. Like the rail companies, it advised passengers to carry a bottle of water.
Nick King, network services director at Network Rail, said: “We sometimes have to put speed restrictions on to prevent our rails from buckling, which can derail a train and cause huge delays. Passengers should check before they travel, by visiting their train operator’s website or National Rail Enquiries.”