What must be stated in the track bulletin if a yellow-red flag cannot be displayed at the proper distance?

The requirement to state that the yellow-red flag is not displayed for requested trains in the track bulletin addresses safety considerations and communication protocols essential for train operations. When a yellow-red flag cannot be displayed at the correct distance, it is crucial to inform all relevant personnel, particularly dispatchers and train crews, of this absence to prevent any potential misunderstandings or safety issues.

By explicitly noting that the yellow-red flag is not displayed for the requested trains, it ensures that all parties are aware of the situation and can take the necessary precautions. This communication is vital because the yellow-red flag serves as a warning signal indicating that there are restrictions or work conditions ahead, so its absence must be acknowledged to maintain safe operational practices.

The other options do not adequately address the specific situation of the flag not being displayed, meaning they fall short of meeting the needs for clear communication and safety in train dispatching.