What is the maximum allowable leakage when testing a train using the Leakage Method?

The correct answer is 5 psi, which serves as the maximum allowable leakage when testing a train using the Leakage Method. This standard is crucial for ensuring that the train's air brake system functions effectively and reliably. By limiting leakage to this level, safety is prioritized, as excessive air loss could compromise the braking system's effectiveness, leading to potential accidents.

When conducting these tests, it’s important to maintain the integrity of the braking system under normal operating conditions. Allowing only a specified amount of leakage ensures that the air brakes can maintain sufficient pressure to activate properly and stop the train safely. The 5 psi limit reflects industry standards established to uphold safety and functionality in rail systems.