Who is authorized to remove a blue signal?

The correct answer is that only the same craft or group that displayed the blue signal is authorized to remove it. This protocol ensures that safety precautions are adhered to during maintenance or repair work on the tracks. When a blue signal is displayed, it signifies that workers are present on or near the tracks and that the train must not proceed, ensuring their safety.

Allowing only the authorized personnel, who are from the same craft or group that initially displayed the signal, to remove it maintains accountability and safety standards. These individuals are typically aware of their working conditions and the status of the work being performed, which is crucial in preventing accidents.

This approach prevents unauthorized personnel from inadvertently undermining the safety measures that have been put in place, thus supporting a secure working environment for all railway workers.