Quote:
Originally Posted by Timothy Turtle
There is a precedent for running trains with no end doors through single bore tunnels - 395s through Shakespeare Tunnel near Dover (although minor mods to the tunnel and numerous risk assessments were required!)
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It isn't automatically the case that all single-bore tunnels require Emergency End Doors. It is only if the clearance is so limited that passengers are prevented from exiting via the main doors and walking along the tunnel that the requirement is invoked.
Shakespeare Tunnel was modified so that some existing passage ways were converted to be special evacuation points. Therefore it doesn't present the egress risks of a confined single bore tunnel.
This is how the Channel Tunnel manages to operate with single bores - there are regular escape routes formed by cross-passages and refuges .
Also with the new Thameslink Canal Tunnels. Although for part of the route they are single bore, the tunnel diameter is much wider than the train width and the extra space incorporates a raised walkway alongside the train for passenger use in emergencies.