During a Transfer Train Air Brake Test, what is the minimum brake system pressure required before making a brake pipe reduction?

The requirement for a minimum brake system pressure during a Transfer Train Air Brake Test is set to ensure that the brake system is functioning adequately before any operational changes, such as making a brake pipe reduction, take place. A minimum of 60 psi is required because this pressure level ensures the reliability of the braking system. It confirms that the brakes have sufficient pressure to operate effectively and maintain safety throughout the operation of the train.

At lower pressure levels, such as 30 psi or 45 psi, the braking system may not function reliably, which could lead to inadequate stopping power or other safety concerns. Thus, 60 psi serves as a critical threshold representing both an industry-standard practice and a safety measure in train operations. This standard helps to minimize risks and ensure that the trains can be operated safely with confidence in their braking systems.