What happens when an emergency alarm box is pulled in the subway?

When an emergency alarm box is pulled in the subway, the primary function is to alert the rail control center, which facilitates an immediate response to the situation. Pulling the emergency alarm box sends a signal to the control center that indicates an emergency has occurred, prompting operators to take necessary actions such as dispatching emergency services or communicating with the train crew.

This system is critical for ensuring passenger safety and responding effectively to emergencies. The alarm ensures that the control center is aware of the incident, which is vital for managing train operations and coordinating a response. The focus on alerting the control center allows for a centralized approach to handling emergencies efficiently.

Lights turning off or power removal may be safety protocols in various situations, but those would not be the direct effect of pulling the emergency alarm box. Automatic stopping of the train also would not typically occur solely from this action, as the control center needs to assess the situation first. Thus, the correct understanding is that the alarm's main purpose is to notify the rail control center of a potential emergency.