What does the emergency alarm system in the subway primarily do?

The primary function of the emergency alarm system in the subway is to ensure passenger safety by providing immediate communication in case of an emergency or unsafe situation. It allows passengers to alert train operators to any incidents that may require urgent attention, such as medical emergencies, security threats, or mechanical failures.

While removing power from the third rail is an important safety measure, it is not the main purpose of the emergency alarm system itself. The system is designed to facilitate a response to emergencies, enabling the operators to assess situations and take necessary actions, which may include stopping the train, initiating evacuation procedures, or contacting emergency services.

The effectiveness of the emergency alarm system is crucial for the overall safety protocols on public transportation, as it empowers passengers to communicate their needs in potentially dangerous circumstances. This aspect highlights the importance of rapid and clear channels of communication in train operations, rather than merely focusing on power supply management or service rerouting.