Once the train is two miles beyond a yellow-red flag with no red flag encountered, what should the crew do?

The situation described involves a yellow-red flag, which indicates a potentially hazardous condition ahead and requires caution. Once the train has passed the flag and traveled two miles without encountering a red flag, it is essential for the crew to operate the train at a restricted speed. This means the train should proceed with caution and be prepared to stop within one-half the range of vision. This is a safety measure to ensure that the crew remains vigilant, aware of any unexpected conditions, or equipment issues that may arise between the yellow-red flag and their current location. Resuming normal speed could lead to dangerous situations if something unexpected occurs; hence, maintaining restricted speed is a prudent and necessary decision to prioritize safety on the tracks.