On Sun, 31 Jul 2016 13:19:28 +0100, Colin Reeves
wrote:

On 30/07/2016 20:50, D A Stocks wrote:
"Roland Perry" wrote in message
...
In message , at 13:50:29 on Sat, 30 Jul
2016, " remarked:

Are they ever going to figure out air conditioning for Tube trains?

Pump the heat out of the trains into the tunnels and stations. What
could possibly go wrong?
--
Roland Perry

Eurotunnel manage something like that in the Channel Tunnel, and they
don't have stations every few hundred yards where they can remove the
excess heat generated.

--
DAS

But, the holes that the trains run through are vastly larger than tube
tunnels - and they have the service tunnel as well. Much more scope for
cooling if needed!

There are doors to the service tunnel and it is at higher pressure in
case of fire so it doesn't really play a part in heat removal. There
are air shafts linking the two running tunnels and there are cold
water pipes in each tunnel to provide cooling.

The other difference between the Channel Tunnel and the tube is there
are no stations so limited braking and acceleration to generate heat.