What is a key component of the flagging procedure?

Using visual signals to direct train movements is a key component of the flagging procedure because it ensures the safe and efficient operation of trains, particularly in areas where standard signals may not be visible or when a track has been disrupted. Flagging involves the use of flags, lights, or other visual aids to communicate important information to train operators regarding track conditions, permissible speeds, and the presence of workers or equipment on the tracks. This is crucial for maintaining safety levels and preventing accidents in railway operations.

The other options lack relevance to the flagging procedure. Promoting high-speed rail usage focuses on transportation policy rather than on operational safety measures. Documenting train schedules pertains to logistical planning, while implementing noise control measures relates to environmental concerns and does not contribute directly to the safe conduct of train movements in the context of flagging.