"bob" wrote in message
...

If we are looking seriously at adopting UIC standards, I would propose
the NLL as a useful place to start. It is already connected to HS1,
and is well placed to link into HS2. It handles a lot of freight
which could make use of the extra space, and the platform length and
overcrowding problems make it a good candidate for DD stock, while the
passenger services are all provided by a relatively small pool of
(potentially) dedicated rolling stock.

And it goes through Hampstead tunnel, which would have to be completely
rebuilt at vast expense?

Paul