What is the PSI reduction needed to apply the brakes during a Transfer Train Brake Test?

The required PSI reduction to apply the brakes during a Transfer Train Brake Test is 15 PSI. This standard is set to ensure that there is enough brake force applied to achieve a safe and effective braking response in the train's operation.

A reduction of 15 PSI is generally sufficient to enable the train's braking system to respond adequately, allowing for safe stopping distances and maintaining control during operation. Depending on train composition and operating conditions, this benchmark is crucial for ensuring both safety and efficiency.

The other options propose different PSI reductions that do not align with the established protocols for this specific test, thus highlighting the importance of adhering to the specified requirement of 15 PSI for optimal brake testing practices.