On 24/02/2012 11:30, d wrote:
On Fri, 24 Feb 2012 11:18:07 +0000
Graeme wrote:
On 24/02/2012 11:07, d wrote:
On Fri, 24 Feb 2012 03:01:45 -0800 (PST)
wrote:
Although the proportion has been getting less, due to the new Jubilee
stations being large concrete boxes and other stations having larger
platforms built in new tunnels. How many holes is the tube allowed to
have before it is no longer a tube?

Does the East london line count as a tube line because of the tunnels
under the thames I wonder?


No. IIRC the tunnels are actually square cross section.

They don't look square to me:

http://en.wikipedia.org/wiki/Thames_Tunnel


Arched as opposed to tube.

--
Graeme Wall
This account not read, substitute trains for rail.
Railway Miscellany at http://www.greywall.demon.co.uk/rail