What is the first step in the procedure to charge a PA5 train?

The first step in the procedure to charge a PA5 train involves inserting the Master Controller (MC) key and turning it to the RUN position. This action is critical as it activates the control systems of the train, allowing for necessary electrical functions to begin. By setting the MC to RUN, it ensures that the train's systems are powered and ready to perform the subsequent operations involved in charging.

This first step is foundational since proper power to the systems is essential for safety, operation, and functionality. Without turning the key to the RUN position, the train cannot be charged effectively, as all control signals and systems would remain inactive. Therefore, this initial action directly enables the subsequent charging processes and operational readiness of the train.