When can red flags be displayed in conjunction with a track bulletin Form B?

Displaying red flags in conjunction with a track bulletin Form B is specifically tied to safety and operational procedures required for work zones on the tracks. The correct answer, indicating that red flags can be displayed at the start of the limits after the stated time, aligns with standard practices to ensure safety for both train crews and maintenance personnel.

When a track bulletin is issued, it outlines specific work being conducted on the track, and the display of red flags serves as visual warnings to train operators that there is restricted access or potential hazards in the area. The flags must be displayed starting at the predetermined limits outlined in the bulletin and from the time specified for the work to commence, ensuring all approaching trains are alerted in a timely manner of the conditions ahead.

This practice helps facilitate safe movement and minimizes the risk of accidents while work is being conducted. Being aware of the proper timing and placement of warnings is vital for maintaining safety on the railways.