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rack and pinion (plural rack and pinions or racks and pinions)

  1. A pair of gears, consisting of a circular pinion that engages with the teeth of a flat bar, that converts rotational into linear motion; used in the steering mechanism of cars, and in some railways.
    • 1950 November, H. P. White, “The Furka-Oberalp Railway”, in Railway Magazine, page 770:
      To sum up, the Furka-Oberalp Railway is a good example of the adaptation of the rack-and-pinion system to a main line over mountainous terrain.
    • 1960 December, Voyageur, “The Mountain Railways of the Bernese Oberland”, in Trains Illustrated, page 752:
      The length of the Wengernalp Railway from Lauterbrunnen over the Kleine Scheidegg to Grindelwald or vice versa, Riggenbach rack-and-pinion operated throughout, should be a "must" in the itinerary of every Oberland tourist; [...].
    • 2021 May 19, David Clough, “Swiss precision meets UK growth”, in RAIL, number 931, page 56:
      Finally, it is the world's leading manufacturer in the rack-and-pinion rail vehicle industry.

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