Andrew P Smith writes
In New York City, the trains have ac and they dump the heat into the
tunnels which are well vented.

Not only are the tunnels much bigger than the tube but they are also
much shallower - so that the many gratings in the roadway can be used to
vent hot air.

--
Dave

in article , Robin Mayes at
wrote on 7/8/03 8:27 AM:

Interesting story in the media about temperatures on public transport on
Wednesday 'the hottest day (so far)'. It appears the tube is actually cooler
than mainline trains (except those lovely C2C trains) or the top of a
double-decker bus, which was hottest.

Perhaps people should be complaining more about getting air-conditioning for
buses, where the extra space could be found, rather than moaning about how
hot the tube is?


High temperatures on overground transport is more tolerable because there is
a greater flow of air. Half the discomfort of the Tube is the dusty, dirty,
still air, which makes the high temperatures doubly unpleasant.