What must a crew do when they encounter a red flag?

When a crew encounters a red flag, stopping immediately and assessing the situation is crucial for safety. A red flag typically indicates a significant hazard or warning that requires urgent attention. By stopping, the crew can analyze the environment, identify potential dangers—such as track obstructions, signal failures, or unsafe conditions—and make informed decisions about how to proceed. This immediate response protects both the crew and the train, ensuring that any risks are addressed before moving forward.

Monitoring speed or proceeding with caution without full assessment could lead to dangerous situations, as the crew may not be fully aware of what the red flag signifies. Contacting dispatch for instructions is important in some contexts, but the priority must first be to ensure that the train is safe to continue its journey. Thus, the emphasis on an immediate stop in the presence of a red flag underscores the commitment to safety and the need for careful assessment in operational procedures.