What is the minimum air pressure on the duplex air gauge for R-44 type equipment?

The minimum air pressure on the duplex air gauge for R-44 type equipment is crucial for ensuring the safe and reliable operation of the train's braking system. The correct answer indicates a straight air pressure of 80 psi and a brake pipe pressure of 110 psi.

This specific configuration aligns with standard operating procedures and manufacturer specifications for R-44 type equipment, which typically requires certain pressure thresholds to function effectively. The straight air pressure needs to be sufficiently high to ensure that the brake cylinders receive adequate force to engage the brakes properly. Likewise, having the brake pipe pressure at 110 psi guarantees that the pneumatic system operates within safe limits, maintaining responsiveness and preventing brake failures during operation.

Understanding these pressure requirements helps operators ensure that equipment is functioning properly and can maintain the safety and efficiency of train operations. Consequently, this knowledge aids in pre-operational checks and diagnostics, ensuring a higher safety standard for the train and its passengers.