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词汇 Vacuum brake
分类 英语词汇 英语翻译词典
释义

Vacuum brake

英语百科

Vacuum brake

Vacuum brake cylinder in running position: the vacuum is the same above and below the piston
Air at atmospheric pressure from the train pipe is admitted below the piston, which is forced up
Graduable brake valve (right) and the small (upper) and large ejector cocks from a GWR locomotive

The vacuum brake is a braking system employed on trains and introduced in the mid-1860s. A variant, the automatic vacuum brake system, became almost universal in British train equipment and in countries influenced by British practice. Vacuum brakes also enjoyed a brief period of adoption in the United States, primarily on narrow gauge railroads. Its limitations caused it to be progressively superseded by compressed air systems starting in the United Kingdom from the 1970s onward. The vacuum brake system is now obsolete; it is not in large-scale usage anywhere in the world, other than in South Africa, largely supplanted by air brakes.

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