What is the correct procedure when making a cut between two PA5 cars?

The procedure for making a cut between two PA5 cars is critical for ensuring safety and proper functioning of the train system. Applying the parking brakes and then depressing the 'ISOLATE' button is essential because it secures the cars and prevents unintended movement during maintenance or inspections. The isolation step is crucial as it helps ensure that the cars are safely separated from the braking system before any further actions are taken. This procedure mitigates risks associated with accidental movement that could lead to accidents or injuries.

In this scenario, the importance of applying the parking brakes cannot be overstated. It’s a necessary action that provides physical assurance that the cars will remain stationary while any work is carried out. By isolating the system afterward, the operator can safely work on the cars without risk of activation of the brakes or motions that could occur if the cars are still connected to the operational systems.

Other procedures mentioned may not provide the same level of safety or are not directly relevant to the process of cutting between the cars. Thus, focusing on parking brakes and isolation aptly aligns with the best practices in train maintenance.