Who is authorized to remove a blue signal to permit passage?

• A. The craft that placed it
• B. The yard crew
• C. The yardmaster
• D. The conductor

Answer: (B)

Blue signals are placed to protect workers on or near track and must be removed only by the people who are on site and responsible for that protection. In yard operations, the on-site yard crew controls the protection they set up and is the group authorized to remove the blue signal once the work is finished and the area is clear. They have the direct knowledge of the conditions and can ensure it’s safe to passage before permitting trains or movements to proceed. The yardmaster oversees operations, but does not typically perform the physical removal; the conductor directs train movements but doesn’t clear protection themselves.