derail

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derail

Chiefly US a device designed to make rolling stock or locomotives leave the rails to avoid a collision or accident

derail

[dē′rāl]
(engineering)
To cause a railroad car or engine to run off the rails.
A device to guide railway cars or engines off the tracks to avoid collision or other accident.
References in periodicals archive ?
TWO people died after an enormous boulder smashed into a tourist train, derailing it.
Mahbubul Alam Bakshi, the head of Bangladesh Railway's northern region, said protesters had deliberately removed fishplates that linked the rail tracks, denouncing the derailing as "an act of sabotage".
Fortunately, the driver of the locomotive had absolutely extraordinary reflexes in that he sounded the alarm immediately, preventing a collision with another train coming in the opposite direction and which would have hit the derailing carriages within seconds.
Police received a call at around midnight that the eastbound CSX train had come off the tracks in downtown Ellicott City, with 21 of its 80 cars derailing.