The heat in the tunnels is largely generated by the trains, with a small amount coming from station equipment and passengers. Around 79% is absorbed by the tunnels' walls, 10% is removed by ventilation, and the other 11% remains in the tunnels.
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Wear light clothing. Even if you think you might need to wear a jacket, when you are on the hot Tube, it's likely you'll want to take it off immediately. Heavy, dark, thick clothing will make you more likely to sweat, and hold on to the sweat your body does produce – keeping you hot and clammy for longer.
If you're seeking a cooler tube ride, you'll want to stick to the Jubilee or Waterloo Lines. With an average of 26.9C and 25C respectively, they recorded the lowest temperatures.
Much of this summer's brutal heat can probably be traced back to Earth's oceans, experts say. Oceans worldwide have been warming for decades, largely due to humans pumping climate-warming greenhouse gases into the atmosphere.
The deepest station is Hampstead on the Northern line, which runs down to 58.5 metres. 15. In Central London the deepest station below street level is also the Northern line.
Thanks to its inclusion of the Mediterranean coast, plenty of European countries experience warm winter weather. However, Spain tends to be Europe's hottest country in summer and winter due to its southern location.
The Metropolitan line is the oldest underground railway in the world. The Metropolitan Railway opened in January 1863 and was an immediate success, though its construction took nearly two years and caused huge disruption in the streets.