Michael Bell <michaelbell@michaelbell.demon.co.uk> writes
>        Rather than very expensively create NEW, it might be much
>better value to make best use of what ALREADY IS. Things like create
>interchange at the dozens of places in London where lines cross
>without any interchange at all or stations just too far apart to be
>really "the same place" the remnant of the railway politics of the
>19th century. Places like :-
>
>        * The crossing of the North London line with the Northern
>line. A pair of underground stations to be dug out. Simple
>but expensive!
[...]
>        It all looks possible, and VERY worthwhile.

And where is the extra capacity to shift all those extra passengers 
going to be found?

-- 
Dave