|railway = derail|
|Derails uncontrolled vehicles to protect the main track|
|Used on these elements|
|Status: in use|
|Tools for this tag|
A derail or derailer is a railway safety device used to prevent fouling of a rail 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.
Derailers may be operated remotely (motorized) or manually with a lever. For safe operation, a manually operated derailer may be locked with a key or locked/verified remotely.
A less 'violent' alternative, more common on busy lines, have a switch that diverges offending trains onto a safer route or a short stretch of rail towards something suitable to stop the train, like a buffer stop or sand bank. These could be tagged as normal switches. The diverging track could perhaps be tagged with service=runaway or catch_point in addition to the normal railway=rail.
- ref=* The reference used for this derailer. Usually digits and/or letters.
- control=* Suggested values: manual, manual_locked, remote_locked, remote.
- operator=* Who may have the key or from which signal controller has the remote control.
suggested by User:Chrisana13