communication cord

From King Dictionary of Contemporary English
Related topics: Trains & railways
communication cordcomˌmuniˈcation ˌcord noun [countable] British English TTTa chain that a passenger can pull to stop a train in an emergency (=a sudden dangerous situation)
Examples from the Corpus
communication cordOverhead is a communication cord, as in a train.And on the second train from Oxford they pulled the communication cord to try to avoid us.I came close to pulling the communication cord.The man opposite me yanks the communication cord, and we lurch to a halt.