The rear locomotive of the lead consist is set-out. After returning to the train, is an Application and Release test required before proceeding?

• A. Yes
• B. No
• C. Only if a train has hazardous material
• D. Only if the locomotive remains visible to crew

Answer: (A)

After a locomotive is set-out and later rejoined the train, the braking system must be verified again. The Application and Release test checks that brake commands from the lead locomotive are properly transmitted through the train and that all units respond correctly to both applying and releasing brakes. Changing which locomotive is in the lead can affect brake pipe pressure dynamics and locomotive control, so this test ensures the train can be controlled safely before moving again. This requirement applies in all such rejoining situations, not just in specific cases like hazardous materials or visibility conditions.