>>981399Oh, cool. You wouldn't believe, but in Helsinki we have like 4 ghost stations, or chambers excavated to bedrock in case when something else has been built. Not really stations, just empty space, but that's what they have been made for.
All but one are related to the long planned but never proceeded north-south "second metro line". This is probably the most complete station in Kamppi, excavated under the current metro station.
What's more, a 5th ghost station is under construction in Pasila. This is a high number for a such a small system I'd say.