The employee must remain at the location until:

• A. The leading end operates through the crossing
• B. The flagging duty is completed
• C. The dispatcher instructs otherwise
• D. The assisting train arrives, or until the employee is recalled

Answer: (D)

When you’re assigned to flag or protect a location, you must stay at that point to maintain protection until you’re relieved. The rule here is that you remain until the assisting train arrives to take over, or you’ve been recalled by the supervisor. This ensures continuous protection of the movement and a clear hand-off of responsibility.

The other scenarios don’t reliably signal that protection is over. Leaving because the leading end is passing through doesn’t end your duty to be available for safe movement, and simply saying the flagging duty is completed doesn’t guarantee there’s no further action required. Dispatchers can recall you, but the trigger to stop protecting is specifically the arrival of the assisting train or being recalled.