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derail
A derail or derailer is a device used to prevent fouling of a rail track by unauthorized movements of trains or unattended rolling stock ("fouling" is a rail term for anything being present on the track - a person, a train, a branch, etc.). It works (as the name suggests) by derailing the equipment as it rolls over or through the derail. In North American practice, the normal position of a derail is in the derailing position (i.e. applied or left on).
==Overview==
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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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