vacuum brake

/V AE1 K Y UW0 M B R EY0 K/
noun
  1. 1

    A brake used on trains, working on the principle of keeping up a vacuum in a continuous pipe or pipes extending under the train, and in brake-cylinders connected to them under each vehicle, the air being sucked out by ejectors or pumps on the locomotive.

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Source: https://en.wiktionary.org/wiki/vacuum%20brake