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Old July 31st 16, 07:07 PM posted to uk.railway,uk.transport.london
Martin Coffee Martin Coffee is offline
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Default Crossrail Elizabeth Line trainset unveiled

On 31/07/16 18:25, wrote:
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.

But the trains have to be powered towards the tunnel exits as there is
an upward gradient.