"Solar Pennguin" wrote in
message ...

IIRC they say the big problems with increasing frequency
on the NLL are that single track stretch at the eastern end,
and the shared working with the District Line at the western end.

The single track section is not a problem because whenever they want to run
more than 3tph on the bulk of the line, they just turn half the trains at
Stratford.

As for Gunnersbury, since Rayners Lane handles 12 tph Piccadilly and 6tph
Met in the peak, I don't see why Gunnersbury-Richmond couldn't handle a
trebling of NLL peak frequency.

The main bottleneck is generally alleged to be freight paths between just
west of Stratford and Camden Road (and to a lesser extent as far as South
Acton).

--
John Rowland - Spamtrapped
Transport Plans for the London Area, updated 2001
http://www.geocities.com/Athens/Acro...69/tpftla.html
A man's vehicle is a symbol of his manhood.
That's why my vehicle's the Piccadilly Line -
It's the size of a county and it comes every two and a half minutes