"Boltar" wrote in message
om...

according to my LU rolling stock book ,
A stock is 9 foot 8 inches wide whereas
C stock is 9 foot 7 inches wide (and that
apperently can go anywhere on the sub
surface lines) so we're only talking
half and inch either side. I can't believe the
clearances are so tight in some of these
tunnels than 0.5 inch makes a difference!
There must be some other reason.

Not necessarily. If you imagine 121 different trains of varying widths from
9 foot 7 to 10 foot 7, with each one being 1/10th of an inch wider than the
previous, the difference between the widest that will fit and the narrowest
that won't fit must be be 1/10th of inch.

--
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