On 2011\11\03 16:18, amogles wrote:

If you're going to be spending billions on interconnecting main line
railways in London it might be better spent on tunnels between the
existing terminii, a bit like the Germans have done in Berlin.
(admitedly Berlin does have an orbital railway, but it is used for the
S-Bahn and only individual sections of it for long distance trains).

Well, I can't see how a long distance train could use all of it!