On Sun, 01 Jan 2012 21:12:10 -0000, Terry Casey
wrote:


The Circle is an Underground (sub surface) line - mainly cut and cover.

The deep tubes are bored.

You can take a tube train on the underground but you can't take an
underground train down the tube ...


Actually I remember hearing about a British Rail track recording coach
being taken through part of the LU network. Must have been in the 1980s.
Did a little damage at the ends of the coach - and to the tunnel - but
nothing too bad. Not sure if they pursued the idea of sharing the resource.

--
Rod