Introduction.
Whatever you call them, underground, subway or metro systems, railways, nearly every major capital city now has one or more. We will look at four of them over the next few months in Moscow, Russia, Paris, France, New York, U.S.A. and London UK.
These are probably the four most well known, because of 'Hollywood and the film industry.' They are really 'the daddy systems of underworld urban transportation and are unique in their history and construction.' Today they are old, in need of some 'Tender loving care.'
The other feature that mark them out for further study are there use of new and old stock trains, while also a mixture of wiring and signalling. They also have secret tunnels and stations no longer used.
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