"Paul Herber" wrote in message
ell.net...

100W+ per person, a couple of MW per train. It all ends up as heat.

Yes, but from my (now possibly incorrect) memory of living in London many
years ago, I seem to remember the Tube was OK in cool weather, but very hot
in hot weather. My point was: shouldn't the temperature be relatively
stable all year round?

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Hungerdunger
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