On Wed, 7 Feb 2007 16:46:16 +0000, "Clive Coleman."
wrote:

In message , Paul Corfield
writes
A similar approach was used at London Bridge IIRC and the platforms here
are different sizes for the Northern Line. All done when the Jubilee
Line extension was built.
The only tube island platforms on the Northern line in the 60s were
Angel, Clapham North and Clapham Common. London Bridge didn't have an
island platform, so were the distances between the wall and track not
enough to give a full platform depth?

There are loads of stations with island platforms - it's just that most
of them have a huge chunk of structure or space between the platforms. I
appreciate I'm being a tad pedantic here but they are conceptually the
same as Angel and the Claphams. This is opposed to side platforms such
as Snaresbrook or Warren St for the Northern Line. You then have tiered
side platforms at places like Westminster (Jubilee Line) and Notting
Hill Gate (Central Line).

The reference to London Bridge was to say that the concept of creating a
new tunnel and platform was used there in the same way as at Angel.
London Bridge was woefully under capacity when only served by the
Northern. Adding in the Jubilee Line derived interchange traffic would
have made it unworkable so it was essential that more space was provided
at the Northern Line level (as well as at ticket hall and circulating
areas).

--
Paul C


Admits to working for London Underground!