On Wed, 10 Aug 2005 23:47:53 GMT, "Jack Taylor"
wrote:


"Clive D. W. Feather" wrote in message
...

The tunnels are all double-track, aren't they? Apart from the new
(short) links.

365s already run through single-track tunnels between Ally Pally and
Potters Bar.

Agreed. However, when the 319s were ordered they were originally designed
without the end doors. The design was required to be modified to allow for
passengers to be detrained in emergency, using front and rear end doors, in
the tunnels under St P/KX. Presumably any following stock will be subject to
the same requirement. I suspect that, as previous posters have suggested,
this may be to do with clearances in the tunnels. I'll have to trawl through
some 1988/1989 "Modern Railways" when I get the chance!


Yes 365s do run through single bore tunnels on the East Coast section,
however in an emergency, it is possible to exit via side doors within
the tunnel. Shakespeare Cliff Tunnel in Kent is single bore and can
only have trains with ends doors through it. In this case, it is
beause the tunnel is very tight to gauge and there is no way anyone
could exit through side doors.

Presumably such tight to gauge tunnels exist on the section of line
between Kentish Town and Farringdon. The section beyond here to
Blackfriars, doesn't since Class 465s, the fore runners too 365s, run
to Smithfield Sidings/City Thameslink.



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