What is the primary purpose of the emergency alarm system on trains?

The primary purpose of the emergency alarm system on trains is to ensure passenger safety. This system is designed to enable passengers to alert the train crew to any emergency situation, such as medical emergencies, security threats, or other critical incidents that may jeopardize safety. By providing an immediate communication channel for passengers, the emergency alarm system plays a vital role in facilitating a swift response, ensuring that help can be dispatched quickly to address any potentially dangerous situations.

In contrast, informing passengers of schedule changes, enhancing train speed, or notifying the crew of maintenance issues are not the core functions of the emergency alarm system. Those activities fall under different operational protocols and communication systems that are not specifically related to emergency management.