wrote in message
...
There appears to be a disused trackbed in the Perivale Area which
passes under the Central Line West Ruislip branch in the Rydal
Crescent area.

http://maps.google.com/maps?hl=en&tab=wl

Anyone know any more about it?

I think you might be looking at the mostly singled section of the old GW
route up from Paddington to South Ruislip and on towards High Wycombe, but
it would count as lightly used, rather than disused. The width of the track
bed may allow for many more tracks than currently in use of course.

Chiltern still use it a couple of times a day into Paddington, there may
still be freight, and FGW occasionally use it as far as Greenford to turn
HSTs...

Paul S