What is the proper procedure when cutting out air brakes on multiple cars?

The procedure for cutting out air brakes on multiple cars emphasizes the importance of safety and maintaining effective braking performance. The correct choice, which states that no more than two air brake devices that have been cut out should be together in a train, is based on ensuring that there is still sufficient braking capability across the entire train.

When multiple brakes are cut out, there is a risk of reduced overall braking power, which could potentially lead to safety hazards in train handling. By limiting the number of cut-out brakes to no more than two in proximity, the train can maintain a more balanced and manageable braking capability. This approach helps to prevent a scenario where too many consecutive failures could compromise the train's stopping ability.

Other choices may suggest different approaches, but the focus on limiting the number of cut-out brakes together ensures compliance with safety protocols and provides better control over train dynamics. Notifying the engineer or isolating only defective air brake devices are also important practices, but without adhering to the limit on the number of consecutive cutouts, the overall safety of the train could be compromised. The intent behind the correct procedure is to maintain train integrity while addressing specific issues with air brake systems.