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 ?
Judging from the dents on the rails and the remarks of the passengers, the police suspect the possibility that the sudden braking produced an outward centrifugal force on the train resulting in the train moving upward and derailing, the sources said.
The train's locomotive, which was transporting coal, ended up on its side after derailing on a set of points just before 2.30am.
Amateur video believed to depict the aftermath of the derailing showed flames soaring more than 70 feet (20 meters) into the air, followed by a huge explosion.