What is the first action an employee must take to remove power immediately?

The first action an employee must take to remove power immediately is to pull down the lever fully in the emergency alarm box. This action directly initiates a critical safety protocol designed to shut down power in emergency situations, making it an immediate response to potential hazards.

In emergency scenarios, speed and decisiveness are crucial, and the emergency alarm box is specifically designed for quick activation. Pulling the lever disrupts the electrical supply and enhances safety for both passengers and crew.

Other options, while important in their respective contexts, do not provide the same level of immediate power removal. Calling the control center or notifying the train operator may contribute to the overall safety procedure, but they do not directly affect the power supply. Activating a blue light is typically for signaling purposes and does not immediately address the need to remove power. Thus, utilizing the emergency alarm box ensures that the response is swift and appropriate in mitigating immediate risks.