Derail
Device that intentionally derails trains due to safety reasons / From Wikipedia, the free encyclopedia
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This article is about the device that intentionally causes a vehicle to derail. For the act of derailing itself, see Derailment. For the bicycle component, see Derailleur.
A derail or derailer is a device used to prevent fouling (blocking or compromising) of a rail track (or collision with anything present on the track, such as a person, or a train) by unauthorized movements of trains or unattended rolling stock.[1] The device works by derailing the equipment as it rolls over or through it.
Although accidental derailment is damaging to equipment and track, and requires considerable time and expense to remedy, derails are used in situations where there is a risk of greater damage to equipment, injury or death if equipment is allowed to proceed past the derail point.