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"I don't know why I write science fiction. The voices in my head told me to!"
- Charles Stross

Slideway  
  A slidewalk, or moving walkway, that moves people forward.  

Hamilton Felix let himself off at the thirteenth level of the Department of Finance, mounted a slideway to the left, and stepped off the strip.
From Beyond This Horizon, by Robert Heinlein.
Published by Street Publications in 1942
Additional resources -

Compare this to the slidewalk in Lieber's 1941 story Sanity.

You might be able to argue that an earlier version of this general concept can be found in the moving roadway from H.G. Wells' 1899 story When the Sleeper Wakes. The first commercial passenger conveyor belt was built in 1954 (by Goodyear for the Hudson and Manhattan railroad). As far as I know, the "electric stairway", or escalator, was introduced in 1900.

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Additional resources:
  More Ideas and Technology from Beyond This Horizon
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Beyond This Horizon
  Tech news articles related to works by Robert Heinlein

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