"R.C. Payne" wrote in message ...
Solar Penguin wrote:
--- Jim Brown said:


If the Bank of England sacrificed its vaults (Very little use for
them now, with the gold sold off) and Cannon Street St was
put underground (Plus a new tunnel under the Thames), would
a tunnel connecting Moorgate and London Bridge be feasible?
Or do the tube lines around there make it impossible?


Interesting idea, Jim... There's also the problem of the slope down
from the high-level platforms at London Bridge to below the level of the
river bed. Especially since the line also has to curve from east-west
to north-south as it drops.

Surely the way to make this work is to build new tube-level platforms at
Cannon St and London Bridge, and break the surface east of London
Bridge? Of course that would increase your price by just a few quid.

Well yes I kind of presumed underground platforms at London Bridge but
I didnt make that explicit. But as a ball park figure and assuming you
could slot it into the London Bridge rebuild I'm guessing it would
cost £3/4 billion. Of course the question then is which line(s) south
of the river would be best to used for a new cross-london service?