Before being added to a through train at an intermediate location, a solid block of cars must:

Before being added to a through train at an intermediate location, a solid block of cars must:

• A. Receive a Class I brake test.
• B. Not be off air for more than 24 hours.
• C. Be weighed and measured for the train.
• D. Be cleaned and lubricated before use

Answer: (A)

When you add a solid block of cars to a through train at an intermediate location, you must verify the brakes on that block are functioning before the train proceeds. This is done with a Class I brake test. The test ensures the block’s braking system charges properly, the brakes respond correctly on both automatic and independent applications, and there are no leaks in the brake equipment. By confirming braking readiness before integration, you prevent a brake defect in the new block from affecting the safety and performance of the entire through train. Other options don’t fit because basic weight checks or cleaning and lubrication aren’t the required safety checks for adding cars to a through train, and being off air for a certain period isn’t the prerequisite action used to authorize movement.

When you add a solid block of cars to a through train at an intermediate location, you must verify the brakes on that block are functioning before the train proceeds. This is done with a Class I brake test. The test ensures the block’s braking system charges properly, the brakes respond correctly on both automatic and independent applications, and there are no leaks in the brake equipment. By confirming braking readiness before integration, you prevent a brake defect in the new block from affecting the safety and performance of the entire through train.

Other options don’t fit because basic weight checks or cleaning and lubrication aren’t the required safety checks for adding cars to a through train, and being off air for a certain period isn’t the prerequisite action used to authorize movement.