What is the correct procedure for uncoupling PA4 cars with the cab at the point of the cut?

The correct procedure for uncoupling PA4 cars with the cab at the point of the cut involves applying hand brakes, charging the train, and then inserting the cutting key. This sequence is essential for ensuring the safety and stability of the train before any uncoupling action takes place.

Applying the hand brakes serves to secure the train and prevent any unintended movement of the cars during the uncoupling process. Charging the train then allows the air system to function properly, ensuring that the brakes on the cars are released appropriately and that there is sufficient pressure in the system to operate the uncoupler. Inserting the cutting key afterward prepares the coupling mechanism for separation. Completing these steps in this order minimizes the risk of accidents that could arise from premature movement or failure of the braking system.

This procedure is designed for safety, ensuring that the train is stable and held securely in place before any movement is attempted, making it the correct approach for successfully uncoupling train cars.