On 9 Oct, 02:08, "John Rowland"
wrote:
Paul Scott wrote:
"Abigail Brady" wrote in message
oups.com...
I was pondering a map the other day, and I noted quite how close
Moorgate and Cannon Street are. I guess the city widened lines to
Moorgate are a lost cause due to the planned work at Farringdon, but
I wondered whether it has ever been suggested to extend the Northern
City Line south of Moorgate and link up with the line at Cannon
Street, making Cannon Street into a through station. This would
allow, say, the extension of Northern City Line services to London
Bridge and points onward (possibly as part of the Thameslink
network?) Has this ever been suggested? Are they any especial
difficulties
apart from the sheer cost of tunnelling in EC2. (Bank of England
vaults?, I can also imagine the gradient being a problem)?

Gradient would definitely be an issue, but isn't the Bank/Monument
station complex in the way of the direct route as well?

http://www.geocities.com/Athens/Acro...069/ltmonu.jpg

It might be able to run through next to the Northern Line.

When DLR extensions
have been suggested in the past it is usually mentioned that the Bank
of England vaults are in the way too!

No, the Waterloo & City is the one which can't be extended without hitting
the bank vaults.

The gradient problems can't be got around (or got under). Extending the
Northern City to a deep terminus the length of Walbrook would give nearly
all of the benefits quite cheaply.

The Northern City is above the northern line - the only way to get
next to or below the northern line is to veer off the route, which
would make it hit bank vaults of one sort or another.

The problem with that is that the walbrook (a river) crosses the path
just east of 1 Poulty. Its in the way of any extension of the Northern
City line south of Poultry. You could divert the Walbrook slightly,
but at some point you'd still need to cross it, although it wouldn't
be such an obstruction to join it up with the Waterloo + City line
(although it has a completely different gauge). On the other hand, if
you did that, you'd need to build completely new access from the
Waterloo + city to the rest of Bank station and to the exit, because
the current access would be in the way of any extension; if you are
going to do that, you might as well build new platforms somewhere just
along the extension, much nearer the rest of bank. That would leave
the current platforms abandoned, unless you built new access to them,
like they are going to do when they demolish bucklersbury house.....