vacuum brake
Concise Oxford English Dictionary © 2008 Oxford University Press:
vacuum brake
▶noun a railway vehicle brake operated by changes in pressure in a pipe which is kept exhausted of air.
'vacuum brake' also found in these Oxford entries:
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vacuum brakeConcise Oxford English Dictionary © 2008 Oxford University Press: vacuum brake ▶noun a railway vehicle brake operated by changes in pressure in a pipe which is kept exhausted of air. 'vacuum brake' also found in these Oxford entries:
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