On Fri, 24 Feb 2012 03:01:45 -0800 (PST)
Andy 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?

B2003