derailer lock

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Railroad switch — For other uses, see Switch (disambiguation). A right hand railroad switch with point indicator pointing to right … Wikipedia
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
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

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