Westinghouse brake

a railroad air brake operated by compressed air.

named after G. Westinghouse, its inventor

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World English Dictionary
Westinghouse brake (ˈwɛstɪŋˌhaʊs)
a braking system, invented by Westinghouse in 1872 and adopted by US railways, in which the brakes are held off by compressed air in the operating cylinder: controlled leakage of the air or a disruptive emergency causes the brakes to be applied. The system is used on most heavy vehicles and is replacing the vacuum system on many railways
[named after George Westinghouse (1846--1914), US inventor and manufacturer]

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