mechanical derailer

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Derail — Not to be confused with Derailment. Derail device installed at an industry, complete with Blue Flag protection A derail or derailer is a device used to prevent fouling of a track by unauthorized movements of trains or unattended rolling stock. It … Wikipedia
Railroad switch — For other uses, see Switch (disambiguation). A right hand railroad switch with point indicator pointing to right … Wikipedia
Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations … Wikipedia
Bicycle chain — This article is about the drive chain on a bicycle. For bicycle chain locks, see Bicycle lock. Bicycle chains Roller chain and … Wikipedia
Incidents on the Washington Metro — Numerous incidents have occurred in the history of the Washington Metro, including several collisions causing injuries and fatalities, and numerous derailments. The Washington Metropolitan Area Transit Authority (WMATA) has been criticized for… … Wikipedia

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