The Victoria line is officially the hottest on the London Underground, with Transport for London (TfL) data revealing that the average platform temperature in 2023 was a sweltering 28.2°C.
During the warmer months from June to October, the average temperature even surpassed 30°C.
Following closely, the Central line recorded an average temperature of 26.7°C, while the Bakerloo line was at 26.0°C.
In contrast, the air-conditioned Circle, Hammersmith & City, District, and Metropolitan lines remained the coolest, averaging a more comfortable 19.3°C.
TfL has been actively working to combat these rising temperatures by implementing various ventilation and cooling solutions. This includes doubling the capacity of the 13 ventilation shafts along the Victoria line. Despite these efforts, the average temperature on the Victoria line has increased significantly from 21.9°C in 2013 to over 28°C in 2023, reflecting a rise of more than 6°C over the past decade.
Temperatures on the Tube platforms are regularly monitored using data loggers, ensuring accurate and up-to-date records. A decade ago, the warmest lines included the Bakerloo, Central, Piccadilly, and Northern lines, all of which had average temperatures below 26°C.
The response to a Freedom of Information request highlighted that London Overground and Elizabeth line figures were not included. It also revealed that there were 49 complaints about high temperatures on the Tube last year, while 15 people reported the opposite issue, finding the Tube too cold.
Nick Dent, TfL’s director of customer operations, emphasized their ongoing efforts to adapt to increasingly extreme and frequent hot weather conditions. “We’re working hard to ensure our transport services remain resilient,” he stated. “We have implemented energy-efficient solutions on new trains, which save energy and reduce the heat generated.
This includes air conditioning, now covering 40% of the Underground network, enhanced tunnel ventilation systems on both the Victoria and Jubilee lines, and solar reflective materials on train roofs and films on windows on the Central line to keep the carriages cooler.”
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