This London Underground line has the fewest stations
So much so that it only operates on weekdays.
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Something futuristic
This tunnel actually leads to the Waterloo & City line, the shortest line in the London Underground.
The most notable example of a disused Tube station
This is the Aldwych tube station, also known as the Strand tube station, which opened in 1907 before ceasing operations in 1994. The station continues to be used as a filming location.