A safety system designed to prevent collisions by automatically triggering an emergency brake application if a train violates a stop signal. Older mechanical versions use a trackside arm that physically trips a valve on the passing locomotive, while newer systems use inductive coils or transponders to enforce signal compliance electronically.
Heard on the job
The motorman missed the red board, but the train stop tripped the brakes before he hit the crossover.
Also heard as
- trip stop