Editing Train stop (section)

{{Short description|Railway safety device}}
{{about|the train protection device|the place where trains stop|Train station}}
{{more citations needed|date=June 2011}}
[[Image:Signal-and-train-stop-melbourne.jpg|thumb|300px|A signal with associated trip arm in the raised position (circled)]]

Part of a [[railway signalling]] system, a '''train stop''', '''trip stop''' or '''tripcock''' (sometimes called a '''tripper''') is a [[train protection system|train protection]] device that automatically stops a [[train]] if it attempts to pass a [[Railway signal|signal]] when the signal aspect and operating rules prohibit such movement, or (in some applications) if it attempts to pass at an excessive speed.