What is the maximum independent brake cylinder pressure allowed on a locomotive with single shoe per wheel brake rigging?

The maximum independent brake cylinder pressure allowed on a locomotive with single shoe per wheel brake rigging is set at 72 psi. This standard is rooted in safety practices and engineering principles that ensure the effective operation of braking systems in locomotives.

The independent brake system is crucial for the control and safety of the locomotive, and the specification of 72 psi balances the need for effective braking force with the need to prevent potential damage to the braking components or wheels. Exceeding this pressure could lead to excessive wear, thermal stress, or even failure of the brake shoes, leading to safety concerns during operation.

This is why the regulatory standard has been established at this specific pressure—it provides effective stopping capability while also maintaining the integrity of the locomotive's braking system. Understanding and adhering to this limit is essential for safe locomotive operations.