How frequently must the communication occur between the driver and the control person during a train movement?

The requirement for communication between the driver and the control person during a train movement is set to ensure safety and coordination. The specification of a minimum of every 10 seconds provides a balance between maintaining clear operational oversight and ensuring that both parties can manage their responsibilities without unnecessary interruptions. This frequency allows for timely updates on the train's progress, any changes needed in operation, and the awareness of potential safety concerns.

This interval supports effective communication that is crucial, especially in situations where circumstances may change rapidly, such as encountering other trains or encountering track issues. Consistent communication at this specified interval ensures that both the driver and the control person can work together effectively, promoting a safer operational environment.

The other options suggest communication requirements that could either overload the communication channel or may not provide enough attention to safety, thereby not meeting the operational standards expected in New South Wales.