When performing a brake test with an end-of-train device, what is the required increase or decrease in brake pipe pressure to indicate successful application?

A successful brake test with an end-of-train device requires a specific increase or decrease in brake pipe pressure to verify that the brake system is functioning as intended. In this case, the correct response indicates that a 5 PSI change in brake pipe pressure is required to confirm the application of the brakes.

This 5 PSI change is significant because it indicates that the brake system is effectively receiving the signal from the locomotive to apply the brakes. If the pressure change is within this specified range, it confirms that the brakes have responded correctly and the system is operational, ensuring safety during train operation.

Knowing this, train crews can reliably assess the performance of the braking system before departure. Utilizing an improper PSI specification could lead to misunderstanding the brake system's readiness, compromising operational safety and efficiency.