Railway staff have been forced to withdraw a service from operation in Oxfordshire on Monday afternoon, declaring conditions "too hot to go on" as Britain experienced its warmest May day in recorded history.
The 4.37pm departure from London Marylebone bound for Stourbridge Junction in the West Midlands came to an abrupt halt at Banbury after the onboard cooling system failed.
Passengers described sweltering conditions inside the five-coach train, with one man captured on video stating: "45 degrees and no air conditioning."
Another traveller remarked sarcastically: "Leaves on the track would be too hard. Normal in the UK now."
Crew members distributed bottled water before evacuating all passengers at Banbury, the train's second scheduled stop, leaving nine further stations unserved.
The mercury at London's Kew Gardens climbed to 34.8C on Monday, smashing the previous May record of 32.8C that had stood since 1944.
Wales similarly rewrote weather records, with Hawarden Airport in Flintshire registering 32.2C on Monday evening. The Welsh record it replaced, 30.6C measured in Newport, had remained unbeaten for 82 years.
Nine counties across England, including Oxfordshire, Greater London, Surrey and Norfolk, saw thermometers exceed 32C during the bank holiday.
Met Office meteorologist Tom Morgan described the conditions as remarkable: "We rarely see temperatures above 35C, even in the summer months, so to see temperatures getting close to 35C in May is, as I say, pretty historic."
The Met Office characterised the bank holiday heat as "exceptional in the UK even in mid-summer, let alone in May," describing the conditions as an "unprecedented" heatwave for this time of year.
Amber and yellow health alerts remained active across England on Monday evening as forecasters warned temperatures could climb as high as 35C on Tuesday.
High pressure building over Britain caused air to sink, compress and warm, driving the extraordinary spell of heat.
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Despite official government advice urging people to avoid direct sunlight during peak hours, tens of thousands headed to beaches, lidos and parks to make the most of the scorching conditions.
Eight regions across the country officially met heatwave criteria on Sunday, having recorded temperatures at or above threshold levels for three consecutive days.
These included Heathrow, Benson in Oxfordshire, Kew Gardens, Northolt, High Beech in Essex, Writtle in Essex, and two Suffolk locations, Brooms Barn and Santon Downham.
Scientists warned the record-shattering temperatures serve as a stark reminder of how climate change is affecting daily life in Britain.
Further periods of extreme heat are anticipated throughout the summer months, driven by a developing "super El Niño" weather pattern.
This phenomenon, which intensifies weather events and amplifies heatwaves, is forecast to fully emerge in 2027 but is expected to begin making its presence felt this summer.
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