What is the required speed reduction when observing one yellow flag?

The required action upon observing one yellow flag is to reduce speed to 8 mph. This requirement is grounded in safety protocols to ensure that engineers or operators can manage the potential hazards signaled by the yellow flag. The yellow flag typically indicates caution, warning of possible track conditions or the presence of other trains ahead.

By reducing speed to 8 mph, the engineer can maintain greater control of the train, allowing for a prompt response to any unexpected situations. This speed limit is typically low enough to ensure safe navigation through potential hazards while still allowing for the possibility of continuing operations, thereby balancing efficiency with safety.

Maintaining current speed or stopping completely would not be appropriate in this context. While stopping might seem safer, it could create additional risks in terms of train operations and movement. Thus, the specific speed reduction to 8 mph strikes the necessary balance, ensuring safety while maintaining operational effectiveness.