What must be done with a blue signal at the entrance to a track?

When a blue signal is displayed at the entrance to a track, it indicates that work is being performed on that track, and it serves as a warning to ensure the safety of the workers. The key aspect of this signal is that rolling equipment must not enter the track while the blue signal is displayed. This is crucial for the protection of workers, as the presence of the signal means that there are people working in proximity to the track, and any entry of rolling equipment could jeopardize their safety.

The safety protocols surrounding blue signals are strict to maintain a secure working environment, which is why attention to this signal is mandatory. Ignoring or bypassing the blue signal can lead to serious accidents. Therefore, the correct understanding of the function of a blue signal ensures that all personnel remain safe while work is being conducted on the track.