It can get extremely warm on the Underground (Picture: AFP)The hot weather looks set to continue into the summer, with the heatwave warming up London – and the high temperatures set to continue in the coming days.
Mask-wearing is still mandatory, so if you’re enjoying a day out in the city or just commuting to work, the Tube is going to feel extra sweaty.
With many Tube lines totally free from air-conditioning, you won’t be surprised to hear it could reach sweltering temperatures.
But which underground lines should you try to avoid on hot days?
What are the hottest underground lines?
The crowded Central Line is often slammed as the hottest on the network but it’s actually the Bakerloo that could be the most sweltering.
In 2019, thermal imaging company Flier predicted the Bakerloo could max out at 42°C, as it more than lives up to its name.
The DLR, Victoria and Jubilee lines are ofter cooler (Picture: Transport for London)If you’re looking for something a bit cooler – and happen to be in south-east London – try the DLR, which is often less warm.
40% of the TfL network has air conditioning, and there’s enhanced ventilation on the Victoria and Jubilee lines.
Sticking to buses might be wise, too. With reflective roofs and opening windows, they can feel a lot cooler than their underground counterparts.
The zero-emission vehicles generate less heat, making it a more pleasant journey.
Why is the Central Line so hot?
The Central Line is one of the hottest tube lines because of its age and depth beneath the ground.
It is one of the oldest lines in London and was opened as The Central Railway in 1900 with early extensions carried out in 1920 and in the 1940s.
The line is a deep-level tube which means it is at least 20 metres underground and travels through two small tunnels to reach each station.
This compact space and lack of ventilation means the heat generated isn’t able to disperse and therefore it stays contained.
The old design of the tunnels makes it difficult to create enough extra ventilation to have a big effect.
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