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- railway=derail
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- Derails
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10 sectionsContents
- Applications
- Design
- Wedge
- Split rail
- Portable
- Powered
- Failures
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thumb|upright|Hinged derail with automatic blue flag
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. The device works by derailing the equipment as it rolls over or through it.
Gallery (6)
Connections
railway track
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signalling control
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derailment
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rubber-tyred metro
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siding
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railway station
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infrastructure
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track gauge
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rail
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Rogers
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level crossing
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railway platform
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railroad switch
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railroad tie
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overhead contact line
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rolling stock
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railway signal
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third rail
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railway electrification system
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railway turntable
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