Your train received a class 1 air brake test and inspection before departing its initial terminal. After you set out cars from the train, what air brake test will be required?

• A. Class 3 Application and Release
• B. Class 2 Release
• C. Class 1 Re-test
• D. Full service test

Answer: (A)

When the train’s makeup changes, you need a fresh air brake check to confirm the brakes still work properly on the new configuration. After setting out cars, the required test is the Class 3 Application and Release. This test checks that brakes on the remaining portion of the train apply correctly and then release, ensuring there are no leaks or stuck brakes and that the system responds as it should with the changed train length. It’s a targeted check for changes in the train consist, quicker than a full-service recheck.

Other tests aren’t the best fit here. A full-service test is more comprehensive than necessary for simply removing cars. A release-only test wouldn’t verify that the brakes actually apply. Re-running the initial Class 1 test wouldn’t reflect the new train configuration.