Brilliant one wonderes why it was never used, it must have cost millions
There is a bit about it here http://en.wikipedia.org/wiki/Antwerp_Pre-metro called the Sleeping premetro but it's in Dutch
I know there's a couple of sections build for the London Underground that have never been used so far, but might be if the Chelsea Hackney line ever gets build.
The only totally abandoned system I can think of is the one in Rochchester NY, but there is another one in America that was built but never used, can't remember where.
Brilliant one wonderes why it was never used, it must have cost millions
There is a bit about it here http://en.wikipedia.org/wiki/Antwerp_Pre-metro called the Sleeping premetro but it's in Dutch