High Quality Content by WIKIPEDIA articles! The vacuum brake is a braking system used on trains. It was first introduced in the mid 1860s and a variant, the automatic vacuum brake system became almost universal in British train equipment, and in those countries influenced by British practice. It enjoyed a brief period of adoption in the USA, primarily on narrow gauge railroads. Its limitations caused it to be progressively superseded by compressed air systems, in the United Kingdom from the 1970's. The vacuum brake system is now obsolescent; it is not in large-scale use anywhere in the world, supplanted in the main by air brakes.

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