When resetting motors on a PA4 train, which key action should be performed?

The key action of moving the reverser key back and forth is essential when resetting motors on a PA4 train as it helps in ensuring that the motors are correctly positioned for safe operation. The reverser key essentially controls the direction of the train's movement and allows the system to reset its operational state. This action can clear any minor faults in the control system, helping to reinitiate the motors effectively.

By moving the reverser key, you essentially allow the system to recalibrate its understanding of the direction and status of the motors, which is vital for their proper functioning after a reset. It ensures that the control logic is aligned and ready for the next operation cycle, reducing the risk of operational errors once the motors are engaged again.