In yards, where will a blue flag that clamps to the rail be placed?

A blue flag that clamps to the rail indicates that a section of track is occupied by maintenance-of-way personnel or equipment and signifies that no trains may enter that section. The blue flag is typically placed at the yellow clearance marker of the track, as this is a designated spot that ensures safety for workers by clearly marking the boundary where trains must not approach.

By placing the blue flag at the yellow clearance marker, it allows for a visual cue that is recognized within safety standards. This positioning helps maintain safe operations in the yard, preventing any accidental movement of trains into areas where workers or equipment may be present, thereby reducing the risk of accidents.

In contrast, other locations, such as the end of the yard, the main entrance, or near the control tower, would not adequately communicate the presence of hazards in the specific section of track where maintenance work is taking place. Understanding the proper location for the blue flag is essential for maintaining safe working conditions in the yard.