What are the hottest Tube lines in London to avoid during the heatwave?
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 youre 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 wont be surprised to hear it could reach sweltering temperatures. The crowded Central Line is often slammed as the hottest on the network but its actually the Bakerloo that could be the most sweltering. In 2019, thermal imaging company Flier predicted the Bakerloo could max out at 42C, as it more than lives up to its name. The DLR, Victoria and Jubilee lines are ofter cooler (Picture: Transport for London)  If youre 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 theres 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. The Central Line is one of the hottest tube lines because of its age and depth beneath the ground. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video  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 isnt 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. MORE : Places in London you should visit, according to TikTok  MORE : Best new London restaurants openings for summer 2021, from Humble Chicken to Bao Kitchen  Follow Metro across our social channels, on Facebook, Twitter and Instagram  Share your views in the comments below