On Fri, 11 May 2007 19:12:29 +0100, Tom Anderson wrote:

Were the line split, one presumes that the Charing Cross branch would
be permenently wed to one of the Edgware and Barnet branches, and the
Bank branch wedded to the other one. The station would then
automatically become one that provided a cross-platform interchange
between two north/south lines, much like Finsbury Park. No tunnelling
needed.

Although the present passageway layout wouldn't be able to handle the
amount of interchange traffic that would result. This is one of the main
reasons why the line hasn't been split, and the reason LU have been
pushing their Camden redevelopment masterplan.

I can't help thinking that can't be the real reason. Building a few
new passageways deep underground doesn't require the demolition of
half of Camden and building of a massive shopping centre.