Movements in the direction of an out-of-service track must be notified by what means?

Notification of movements in the direction of an out-of-service track must be conducted through formal communication channels, specifically using a Bulletin Order or Form D. This requirement ensures that all relevant personnel are adequately informed about the status of the track, which is critical for safety and operational efficiency.

Using Bulletin Orders or Form D helps in maintaining a consistent and standardized method of communication, thereby reducing the risk of misunderstandings that can arise from less formal methods like verbal notifications or radio alerts. These documents serve as official records and provide clear, precise instructions regarding the status of the out-of-service track, including details such as the extent of the outage and any necessary precautions to be taken by crews.

In contrast, other options, while they may involve communication, do not fulfill the specific requirement outlined for notifying movements regarding out-of-service tracks as effectively or formally as Bulletin Orders or Form D do.