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 ?
At the same time, recognize that all organizations have saboteurs; folks, who through action or inaction, try to derail change initiatives.
Measures implemented include: -- CN installed or moved 828 derails.
A freight train operated by the same railroad involved in the Cajon Pass accident derails one month after the Cajon Pass accident injuring six people and spilling ammonia fumes forcing the evacuation of nearby residents.