During a Straight Air rupture on a PA-4 train, what pressure should register when the brake handle is in FULL SERVICE position?

In the event of a Straight Air rupture on a PA-4 train, the brake handle being in the FULL SERVICE position is associated with a specific pressure reading that helps determine the system’s functionality. When the pressure registers at 45-60 pounds, it indicates that the system is receiving sufficient pressure required to effectively apply the brakes.

This pressure range corresponds to the operational standards for the braking system of the PA-4 train during normal service. It ensures that there is enough pneumatic force available to engage the braking mechanism properly, providing the necessary stopping power when required.

A pressure reading below this range might signal issues with the brake system, such as a malfunction in the air supply or leaks that affect brake performance. Conversely, significantly higher pressures are not typical for a FULL SERVICE setting in standard operations, further explaining why the indicated pressure range is the expected and correct figure during such incidents.