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the London clay that the underground railway the tube locks the heat generated by the railway and has gradually been getting hotter. in the 1900s it was 14°C, today it is nearly 25°C. Most of the heat comes from the trains braking.

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Fun Fact: the London clay that the underground railway – “the tube” – locks the heat generated by the railway and has gradually been getting hotter. in the 1900s it was 14°C, today it is nearly 25°C. Most of the heat comes from the trains braking.

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wired.co.uk

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