What is the main purpose of the automatic stop device in a train system?

The main purpose of the automatic stop device in a train system is to prevent collisions by stopping trains at signals. This device acts as a safety mechanism that ensures trains adhere to the signals displayed along the track. When a signal indicates that a train must stop, the automatic stop device intervenes to bring the train to a halt if the train operator fails to respond in time. By doing so, it helps maintain safe distances between trains and prevents accidents caused by miscommunication or oversight.

While improving passenger service, alerting the crew of technical issues, and managing train schedules are important aspects of train operations, they do not directly relate to the core function of the automatic stop device, which is specifically designed to enhance safety by preventing collisions.