"Paul Corfield" wrote in message
...
Ask the London Transport Museum? or ask the London Underground
Railway Society? or put a posting on the District Dave Forum site?
http://districtdave.proboards.com/index.cgi
There is a section for Historical questions and there are some very
knowledgeable people amongst the forum's membership. You will need to
join the forum if you are not already a member. A quick look in the
History section does not bring up anything obvious.
Thanks, Paul.