Which system is vital for train control and safety?

The communication system is vital for train control and safety because it facilitates real-time communication between train operators, control centers, and signal systems. This connectivity is essential for conveying critical information regarding train positions, speeds, and any potential hazards on the tracks. Effective communication ensures that operators can make informed decisions, adhere to schedules, and respond quickly to emergencies, thereby significantly enhancing the safety of train operations.

In contrast, while the ticketing system is essential for managing fare collection and serving passengers, it does not directly impact train control or safety. The visual inspection system is important for ensuring equipment and track integrity but does not provide the ongoing, real-time operational data that the communication system offers. Lastly, the power supply system is crucial for the operation of trains but does not govern their movement or safety protocols, which is where the communication system plays a pivotal role.