"Roland Perry" wrote in message
...
In message , at 01:44:25 on Sun, 3 Jan
2010, David A Stocks remarked:
I believe the Northern Line station is roughly under the main line
bridge across Borough High Street.

I understand the building to the left of the bus in this picture

http://maps.google.com/maps?hl=en&ie...088942&spn=0,3
59.997707&z=19&layer=c&cbll=51.505758,-0.088855&panoid=M2QGsJwg0TBS9XLyj
J0H4w&cbp=12,101.81,,0,5.53

is part of the original Northern Line station building at the head of the
lift shaft, now a ventilation shaft. If so, the south end of the tube
platforms will be slightly north of this location, probably the other side
of the main line bridge.

I agree about the building (and I've been inside and down to the old C&SLR
station). What I'm not so clear about is why that marks the southern end
of the platforms. Do you have a station plan showing the position of the
lift shaft with respect to the platforms?

My own recollection is that the bottom of the liftshaft is just to the
south of the current passageway from the bottom of the main escalators to
the Northern Line platforms, but I can't remember how far along the
platform that passageway emerges.

I'm relying on my memory of the station before the Jubilee Line was built. I
used to go through it most working days and recall the passageway from the
bottom of the escalators emerging at the extreme south end of the northbound
platform. The northbound platform was extended to the south (I'm not sure
how far, but it can't be very much) when the old southbound platform tunnel
was converted into a circulation area between the platforms.

The OPs suggestion that the Jubilee Line should have built further north in
order to facilitate an interchange with the existing Northern would probably
have meant putting the Jubilee Line plaforms under the river. This would
have been a bad interchange with the main line, and may well have run into
other problems because ISTR one of the reasons for building a new southbound
(rather than northbound) platform tunnel was that the new tunnel had to be
threaded around the foundations of both the current and pre-1830 London
Bridges, not to mention the old C&SLR tunnels to King William Street
station.

D A Stocks