vacuum brake

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Related to Vacuum brakes: Air brakes

vacuum brake

n
(Railways) a brake system, used on British and many overseas railways, in which the brake is held off by a vacuum on one side of the brake-operating cylinder. If the vacuum is destroyed by controlled leakage of air or a disruptive emergency, the brake is applied. It is now largely superseded by the Westinghouse brake system
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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But as soon as the vacuum brakes were repaired the train began moving forward.
"As these are the subject of both a change in the manufacturing method and design in order to accommodate air brakes and steam-driven air pumps instead of the vacuum brakes fitted onto the originals, design justification that the original design worked satisfactorily is not enough," says Allatt.
Vacuum brakes posed a serious threat to Westinghouse.(87) The Massachusetts Railroad Commission, headed by Charles Francis Adams, Jr., conducted a comparative trial of the two systems on the Eastern Railroad in April 1873.(88) The vacuum system apparently impressed many New England roads, for in November 1874 Wootten heard from Isaac Hinckley, president of the Philadelphia, Wilmington, and Baltimore Railroad, that "the Boston and Maine, the Boston and Albany, and the Grand Trunk ...