When workmen are on equipment on the main track, where should the blue flag be placed?

The blue flag should be placed at each end of the equipment when workmen are on it in the main track. This is essential for safety as the blue flag serves as a signal to other train operators that work is being conducted on or near the equipment, thereby restricting the movement of trains in that area. By placing the flag at both ends, it ensures that anyone approaching the work zone from either direction is adequately warned and can take the necessary precautions to avoid potential accidents. This practice helps maintain a clear and consistent safety standard in areas where maintenance or other work is being performed, ensuring the protection of the workmen and the integrity of train operations.