On Oct 24, 8:31*am, Stephen Allcroft
wrote:
IMHO, a main line loading gauge, express, Northern Line still has
merits-

Yes but how would you pay for it?

In the unlikely event that HMG should agree, I guess it would be
Crossrail 4. It might function like an RER line in Paris. One
could, say, link Chessington and Leatherhead with Northampton by way
of
Charing Cross, Tottenham Court Road and Euston.
This will never happen, but I imagine the hard pressed commuters on
the Morden Branch of the Northern Line would enjoy the Express
Option. :-)
So, to answer your question it would have to be financed much like
Crossrail one, and after Chelsey to Hackney and whatever Crossrail
three is/was supposed to be!
The economy will have to be rescued first.