One of the functions of the emergency alarm system in the subway is to accomplish what?

The emergency alarm system in a subway is primarily designed to alert relevant personnel and ensure safety in emergency situations. This system’s functions are crucial during emergencies, as they help manage incidents effectively and maintain safety for passengers and crew.

One of the key functionalities of the emergency alarm system is to sound a warning signal. This audible alert serves to inform both the train operators and passengers of an emergency, prompting immediate response and evacuation procedures if necessary. The signal not only alerts those inside the train but also communicates the situation to station personnel or first responders, ensuring that help can arrive quickly.

While the activation of emergency lighting, removal of power from the third rail, and engagement of backup systems are important safety features within a subway system, they are not the primary functions of the emergency alarm itself. Instead, these functions may be part of a broader emergency response strategy or systems that operate concurrently with the alarm system but are not the direct results of triggering the emergency alarm.