For a Class I Brake Test, how many PSI are required on the rear car?

In a Class I Brake Test, the standard requirement for the air brake system is that a minimum of 75 pounds per square inch (PSI) must be established on the rear car. This is crucial to ensure that the air brake system is fully charged and operating effectively across the entire train.

Establishing 75 PSI allows for sufficient pressure for proper brake application and ensures that all brakes on the train are functioning as intended. This is particularly important for safety and performance, as it confirms the integrity of the braking system throughout the length of the train.

Lower PSI levels may not provide adequate braking power, potentially leading to issues in stopping capacity and overall safety. Therefore, maintaining this required PSI level is fundamental in conducting a Class I Brake Test successfully.