In message
Chris Tolley wrote:

[snip]

And there are plenty of disused tunnels to speculate about, most
recently the original alignment of the Jubilee line. Of course, some
unlikely tales about goings-on in tube tunnels turn out to be quite
true, like the one about building aircraft in the Central Line Eastern
extension tunnels during WW2.

Turned into a Plessey factory using about about 7 miles of twin running
tunnels.

--
Graeme Wall
This address is not read, substitute trains for rail.
Transport Miscellany at http://www.greywall.demon.co.uk/rail/index.html