Cut out airbrakes on a car is required under which condition?

• A. The brake does not release when it should
• B. The car must be moved with an overheated bearing
• C. Both A and B
• D. Neither A nor B

Answer: (C)

Cutting out air brakes on a car is done to isolate that car from the train’s automatic brake system when there’s a condition that could cause unsafe braking or damage. If a brake doesn’t release when it should, the car would continue to apply braking force and could drag or overheat; removing its air brake from service lets the rest of the train stop safely while the issue is addressed. If a car must be moved with an overheated bearing, keeping the air brake connected could cause unpredictable braking or add stress to the wheel and bearing; cutting out the air brakes prevents the car from being affected by the train’s brake system during movement and inspection. Therefore, both situations require cutting out air brakes on that car.