For a Class I Brake Test, what is the required PSI on the rear car for brake application?

In a Class I Brake Test, the required air pressure on the rear car for a successful brake application is 75 PSI. This level of pressure is necessary to ensure that the braking systems on the train are functioning effectively and can safely bring the train to a stop.

Maintaining the right air pressure is crucial for ensuring that the brakes engage properly. At 75 PSI, the system can perform as designed, which is vital for both the safety of operations and the reliability of the braking mechanism. If the pressure were to be set too high or too low, it could lead to insufficient braking force or even brake failure, which poses significant risks during train operations. Thus, adherence to the specified pressure is essential for maintaining safety and compliance with regulations during brake testing.