What must happen for train operations to resume after a yellow-red flag situation?

For train operations to resume after a yellow-red flag situation, it is crucial that a crew member receives proper instructions. This ensures that the crew is aware of the current conditions and any specific protocols that need to be followed to safely continue operations. Proper instructions provide the crew with vital information about the status of the track, potential hazards, and coordination with other train operations in the area, which enhances safety and efficiency.

While automatic checks, clear communication with the dispatcher, and equipment inspections are all important components of safety protocols in train operations, they do not specifically guarantee that the crew is prepared and informed to handle the situation safely. Ultimately, without clear instructions provided to the crew, the risk of miscommunication or misunderstanding increases, potentially endangering safety. Receiving proper instructions is a critical step that prioritizes the crew's readiness and understanding before resuming operations.