[Ragnarork]

This reminds of the project that aimed at creating a new business/commercial complex south-east of Paris in Noisy-Le-Grand. A real estate promoter had a big project, and a metro line was designed, then built, but the real estate project went into bankruptcy and never got out of the ground.[0]

The metro line was completed, inaugurated, but never opened to the public, and eventually mothballed. For quite a while, it was rumored that they operated trains once a month to keep the system working and maintained, not sure up until when.

[0] https://en.wikipedia.org/wiki/Noisy-le-Grand_Metro

[Pyrodogg]

The Tim Traveller channel on YouTube did a couple videos about this [1] and [2]. The station was open for a brief time for some public tours before being redeveloped. He also links to some archival footage from 1997 showing it in motion [3].

[1] https://www.youtube.com/watch?v=bWxESIzJhCU [2] https://www.youtube.com/watch?v=KGIz_zwoALU [3] https://www.youtube.com/watch?v=yMHW9cEAO78