What feature is primarily designed for helping passengers understand departures and arrivals?

The correct answer is focused on the real-time tracking system, which plays a crucial role in helping passengers stay informed about departures and arrivals. This system provides live updates on train locations and estimated arrival times, allowing passengers to plan their journeys more effectively. By displaying current information, it alleviates uncertainty and enhances the overall travel experience.

In contrast, while CCTV monitoring primarily serves safety and security purposes, it does not directly convey information about train schedules. User feedback kiosks enable passengers to provide input about their experiences but do not address the need for real-time travel information. Printed schedules, while beneficial, can quickly become outdated and do not offer the immediate updates that a real-time tracking system provides. Thus, the real-time tracking system stands out as the most effective feature for keeping passengers informed about their journeys.