When should a running brake test be conducted?

A running brake test is an essential safety procedure that ensures the train's air brake system is functioning properly before beginning its journey. Performing this test before leaving any terminal is crucial because it allows for the verification that the brakes engage effectively while the train is in motion. This testing helps identify any issues with the braking system that could pose risks during transit.

Conducting the test at various other times, such as the beginning of a shift or after a crew change, might not comprehensively assess the train’s performance under operational conditions. Also, testing at the end of the day is important but serves a different purpose compared to a running test before departure. It typically focuses on the evaluation of the train's condition after its last run rather than ensuring its readiness for the upcoming journey. Therefore, the most appropriate time to conduct a running brake test is before leaving any terminal, ensuring passenger safety and operational reliability from the outset of travel.