On 2012\05\22 10:47, Jamie Thompson wrote:

I doubt those tunnels would be of much use. In truth, the 3 mile
shortest option between Euston and Waterloo is the minimal case. The
greatest benefits would
probably be to tunnel between Willesden and Clapham Junctions as it
would relieve the terminal approaches as well as the platforms.

If there is that much need to relieve Waterloo, why are the Eurostar
platforms sitting there gathering dust? AFAIK the approaches to Waterloo
are underused: the Richmond lines have hardly any trains on them.