Train services across Britain are being disrupted as temperatures soar.
Network Rail has imposed a series of speed restrictions on tracks to keep trains safe.
South Western Railway (SWR) issued a general alert to all passengers, stating that services across its entire network “may be revised” because of the hot weather on Tuesday.
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It cancelled a number of services scheduled to run in the afternoon and early evening.
This is affecting journeys between London Waterloo and Weymouth via Winchester, Southampton and Bournemouth, and between London Waterloo and Aldershot via Woking and Guildford.
Some services between Exeter St Davids, Salisbury and London Waterloo are only running as far as Basingstoke.
Services at London Waterloo are also being disrupted by a signalling failure.
A report of smoke between the station and Vauxhall also caused delays earlier on Tuesday.
National Rail Enquiries said Elizabeth line services between London Liverpool Street and Stratford are disrupted.
LNER said two speed restrictions on its routes are causing delays.
Its services are limited to 20mph on what are usually 125mph lines at St Neots, Cambridgeshire, and Tollerton, North Yorkshire.
The operator said there is also some alterations to services because it is running more Azuma rather than InterCity225 trains, as the former have better air conditioning.
Great Northern said damage to overhead electric wires mean it cannot run services between Cambridge and Kings Lynn.
Disruption was expected to continue until 4.30pm.
Overhead electric lines can expand and sag in hot weather.
This results in trains having to travel more slowly to avoid damaging the lines.
Steel rails also expand as they get warmer, reaching as much as 20C hotter than the air temperature when in direct sunshine.
Trains are forced to run slower to reduce the likelihood of buckled rails.
Meanwhile, the East Anglian Daily Times reported that a section of the A143 road in Stanton, near Bury St Edmunds, has melted in the high temperatures.
The highway authority is applying sand and granite dust to the site to prevent further damage.
The AA said the number of breakdowns it attended between Friday and Monday was up 15% on the same period last year, as “heatwave conditions put extra strain on vehicles”.
The company received 34,124 callouts over the four days, compared with 29,602 during the same bank holiday period in 2025.
Sunday and Monday had the biggest year-on-year increases with callouts up 21% on both days, while on Saturday and Friday there were rises of 17% and 5% respectively.
Lee Morley, AA expert patrol, said: “Hot weather can be tough on vehicles, particularly if they are already carrying a fault, low on coolant or stuck in heavy traffic for long periods.
“Overheating can escalate quickly, so drivers should not ignore warning lights, rising temperature gauges, steam, unusual smells or any change in how the vehicle feels.
“If something does not seem right, it is better to stop somewhere safe and investigate rather than push on and risk causing more damage.”
