a device on a train which applies the brakes when engaged by a projection on the track, if the train is passing a signal set at danger.
| 单词 | θ202818 | 
| 释义 | society > travel > rail travel > rolling stock > 			[noun]		 > locomotive > automatic safety braking device (1)		 tripcock1906 a device on a train which applies the brakes when engaged by a projection on the track, if the train is passing a signal set at danger.  | 
	
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