Where should a blue flag be placed on tracks other than the main track?

A blue flag is an essential safety device used in railroad operations to indicate specific conditions that require caution, particularly in relation to work being performed on or near tracks. When it comes to placement on tracks other than the main track, the correct practice is to position the blue flag at each manually operated switch for that track.

This placement is crucial because it informs workers and train operators that the track is either out of service or being worked on, thus enhancing safety by clearly signaling where caution must be exercised. By placing the flag at each switch, it ensures that any movement of trains into or through that area is controlled, preventing unintended access that could compromise safety.

This method creates a clear visual cue that can be easily recognized by anyone approaching the area, thereby improving communication regarding the status of track safety. It allows for effective coordination between workers and train operators, which is vital in preventing accidents and ensuring that operations can resume safely once the work is completed.