You observe a yellow flag displayed to the right of your track with no track bulletin. What is required?

• A. Continue at normal speed until you reach the next signal.
• B. Continue moving no more than 10 mph; resume speed after the rear passes a green flag or after traveling 4 miles beyond the yellow flag with dispatch verification of no track warrant.
• C. Stop immediately and wait for a green flag.
• D. Proceed at 20 mph until dispatch verification.

Answer: (B)

The rule being tested is how to proceed when you encounter a yellow flag on the track without a matching track bulletin. A yellow flag signals a temporary restriction ahead, so you must slow down and move with caution rather than continuing at normal track speed. When there’s no track bulletin, the procedure is to restrict your speed to a controlled, slow pace and only return to normal once the track has been verified as clear.

In practical terms, you should not exceed a very limited speed—10 mph in this scenario—and you can resume normal speed only after either the rear of the train passes a green flag or you have traveled a defined distance beyond the yellow flag (four miles) with dispatch verification that there is no active track warrant. This ensures the dispatcher has confirmed the track is clear and there are no holds or warrants affecting movement.

The other options don’t fit because they either keep you at normal speed despite the caution signal, require stopping immediately, or push you to a higher speed without the necessary clearance verification. The responsible approach is to proceed at a restricted speed and await proper clearance before returning to normal speed.