A Derail or Derailer is a device used to prevent fouling of a track by unauthorized movements of trains or unattended rolling stock. It works (as the name suggests) by derailing the equipment as it rolls over or through the derail. Operating a train over a derail will usually result in a derailment. However, derailments can also occur accidentally, without the use of a derailer. Derails may be applied: · where sidings meet main lines or other through tracks · at junctions or other crossings to protect the interlocking against unauthorized movement · at an area where crews are working on a rail line (via a portable derail device) .]]There are three basic forms of derail. The most common form is a wedge-shaped piece of steel which fits over the top of the rail. If a car or locomotive attempts to roll over it, the wheel flange is lifted over the rail to the outside

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