What is one of the key functions of the emergency alarm system?

The emergency alarm system plays a critical role in ensuring the safety of both passengers and crew during a train's operation. One of its key functions is to automatically remove power from the third rail in the event of an emergency. This is vital because it helps prevent electrical hazards that could occur if a train were to experience an incident, such as a derailment or an accident involving personnel. By de-energizing the third rail, the system mitigates the risk of electrocution and provides a safer environment for the evacuation of passengers and emergency responders.

Each train's design typically incorporates these safety features to protect against potential dangers, thereby demonstrating the importance of the emergency alarm system in maintaining safe railway operations.