What must be done when placing a blue signal at night?

The requirement for a blue signal to be illuminated at night is crucial for ensuring clear visibility and safety on the tracks. Illuminating the blue signal serves to effectively communicate the same warnings and protections as during the day, making it easier for train crews and personnel to recognize its presence and the associated safety protocols.

When a blue signal is illuminated at night, it indicates that work is being performed on or near the tracks, thus preventing train movement into that area and maintaining the safety of employees working there. This helps to minimize the risk of accidents, as the signal serves as a vital visual cue in low-light conditions. Illumination is fundamental to the signal's function and effectiveness, ensuring that it fulfills its purpose no matter the time of day.

Proper placement and illumination protocols are critical components of operational safety regulations, and it is essential that personnel follow these directives to ensure a safe working environment.