What is a necessary action when removing blue signal protection from a locomotive?

When removing blue signal protection from a locomotive, it is crucial to first take down the blue signal from the outside of the cab. This action signifies that the protection is no longer in place and communicates to others in the area that work can safely resume. The blue signal is a visual indication meant to prevent unauthorized movement of equipment while personnel are close to the train or locomotive. Once the signal is removed, it is clear that the area is considered safe and that crew members can proceed with their duties.

Other actions, while important in the broader context of safety, do not immediately pertain to the specific procedure of removing blue signal protection. For example, ensuring all crew members are accounted for is a good safety practice but is typically addressed before removing the signal to ensure that everyone is safe. Running the locomotive immediately away from the area is unnecessary without proper notification that conditions are safe for such movement. Likewise, waiting for dispatcher instructions is not applicable at the moment of signal removal, as the focus is on the physical act of taking down that signal.