What should train crew members rely on to tell accurate time while on duty?

Train crew members should rely on a traditional watch to tell accurate time while on duty because it provides a consistent and reliable means of timekeeping that is not dependent on external factors. Watches are typically designed to be durable and can be worn directly on the body, making them easy to check at any moment without needing to access a larger device or location.

Using a traditional watch is advantageous because it is not subject to signal disturbances, battery issues, or internet connectivity limitations that can affect mobile devices. Additionally, watches are often calibrated to ensure they keep accurate time, which is crucial for synchronization during operations and adherence to schedules.

While other options like clock towers, station clocks, and mobile devices might seem viable, they can present challenges such as availability, discrepancies in time, or reliance on external conditions. For train crews, having a dependable and portable means of keeping accurate time like a traditional watch is essential for safety and operational efficiency.