Mind the gap
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Some station platforms on the London Underground railway are curved. Since the carriages are straight, the distance from the platform to the carriage is greater than normal, and at such stations the words "MIND THE GAP" are painted on the edge of the platform. A recorded announcement is also played whenever a train arrives at a station, consisting of "Mind the Gap" repeated over and over, followed by "Stand clear of the doors, please." as the train is about to depart. The Central Line platforms at Bank and the Bakerloo Line platforms at Piccadilly Circus are some of the more extreme examples.
Deep level tube trains have a floor height around 20 cm less than cut-and-cover trains. Where these trains share platforms, for example some Piccadilly Line (deep level) and District Line (cut-and-cover) stations, the platform is built as a compromise between the two. The "mind the gap" warning is used in this situation as well.
The phrase is also used by other transit systems, notably the Toronto Transit Commission who have their own logo posted prominently in all train stations:
References to the phrase
The phrase is well enough known for London Underground to print it on T-Shirts sold to the public.
The phrase also inspired songs of the same name by Judge Dread, the Soundtrack of Our Lives, and Matrix.
In Neil Gaiman's novel Neverwhere, Richard Mayhew (the protagonist) ignores the warning and encounters a beast known as "The Gap".