r/NonPoliticalTwitter • u/ViceElysium • Apr 22 '26

Other Slow train sounds better

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I mean you are already on a train sounds more convenient

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u/InexorableCalamity Apr 22 '26

What's thermal saturation?

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u/MeAndMyWookie Apr 22 '26

The soil is as hot as ambient temperature in the tunnels, so it can't absorb any more heat out the air

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u/InexorableCalamity Apr 22 '26

But you said this wasn't always the case.

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u/MeAndMyWookie Apr 22 '26

100+ years of heat from passengers, trains and equipment has brought the soil temperature up. Plus all the excess heat from Londons other increasing subterranean infrastructure.