John Rowland wrote:
Its not unrealistic. Thats exactly how the NYC Transit
museum is set up. Its based in an old disused subway
station on a spur from the main line and in the platforms
they've got lots of old stock that you can wander around in.

I presume that is not a tube line, but a shallow skirt-blower line, from
which emergency exit could be made by the most asthmatic in about a minute.
The moribund Thameslink line from Farringdon to Moorgate could probably
become a museum, but for the deep tube Aldwych station with no lift or
escalator it is not practical.

From memory (and I only went there in December) you walk down one set
of stairs to get to the museum's mezzanine level, and then a further set
of stairs down to the platforms.

I think the station is called State, but I might be wrong - it is
directly below a big court house.

http://mta.info/mta/museum/index.html

The platform level appears to have one of each car for the history of
the subway, so you can start at one end and walk right through the whole
history of the trains. (What's rather more enjoyable are the photographs
of some of the old generating stations, which were in a temporary photo
gallery when I was there).