vacuum brake

(from the article `railroad`) There are two principal types of continuous train braking system: vacuum, which now survives mostly on Third World railroads, and compressed air, the ...
Found on http://www.britannica.com/eb/a-z/v/1

vacuum brake

a mechanical brake in which the friction members are actuated by a controlled variable vacuum acting against a relatively constant higher vacuum
Found on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=811-06-16

Vacuum Brake

A vacuum brake is a type of brake largely used on railway trains. It acts by the differences of pressure on each side of a piston in an exhausted air chamber.
Found on http://www.probertencyclopaedia.com/browse/GV.HTM

Vacuum brake

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 USA, primarily on narrow gauge railroads. Its limitat...
Found on http://en.wikipedia.org/wiki/Vacuum_brake
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