Lower Queen Station
Early subway expansion plans called for an east-west subway for streetcars under Queen Street, and a lower Queen station for these was roughed in under the subway station. Priorities changed and the line was never built, but many people unknowingly pass through this lower station every day; the tunnels that go under the station so that riders can move between northbound and southbound platforms use portions of this intended station, with most of the excess infrastructure walled off.
Strictly speaking, it is only a roughed-out second set of platforms built underneath a currently-operating station. It is located directly underneath the existing station. The station was designed as part of a planned but never-built streetcar subway that would have run east and west along Queen Street. A similar station was planned underneath the existing Osgoode station (also situated along Queen Street). Although underground pipes and conduits were specifically routed around this intended site, construction was never started.
The trackway was planned for streetcars rather than dedicated subway trains, similar to the much newer streetcar-only underground track originating at Union Station used for the 510 Spadina and 509 Harbourfront routes. The Queen subway would have allowed streetcars from the Queen line (now route 501), King line (now route 504), Kingston Road line (now routes 502 and 503), and Dundas lines (now route 505) to avoid centre-city traffic, and then surface to run on regular streets in outlying areas.
The plan to build a streetcar subway under Queen Street was delayed and then cancelled in favour of an east-west line further north, which became the Bloor-Danforth line. As a result, the Lower Queen Station was never put into service. Unlike the abandoned platform at Lower Bay, this station is not used in any way save as an occasional storage facility and film set, and the aforementioned passageway. - From Wikipedia, the free encyclopedia