moving staircase

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escalator, moving staircase, moving stairway

A power-driven, inclined, continuous stairway used for raising or lowering passengers.
References in periodicals archive ?
Hogwarts is a Gothic treat to behold, with portraits that have a life of their own, moving staircases and the cosiest common room ever.
With its moving staircases, animated paintings, free-floating candles, night-sky ceiling and hidden vaults, Hogwarts School of Witchcraft and Wizardry is everything you could wish for.
I'm sure many people get annoyed like me, when they only used the moving staircases in the first place because they thought there would be another for down.