Under what circumstances can workers resume work after stopping?

The correct answer is based on the necessity for ensuring that the area is safe before any work resumes. Workers are required to wait until the trailing end of trains or on-track equipment has passed and remains ahead of their worksite. This precaution is crucial because it ensures that there are no moving trains or equipment that could pose a danger to the workers.

By being certain that the trains or on-track equipment are no longer a threat, workers can proceed with their tasks without the risk of encountering unexpected movements, which can lead to accidents or injuries. Safety protocols prioritize the visibility of the work area and the control of any potential hazards before resuming activities.

Other choices do not adequately address the specific safety concerns related to train and equipment movements. Approval from nearby workers does not ensure safety, completing safety checks does not guarantee that the work area is clear, and simply waiting for 10 minutes does not account for whether any trains or equipment could still be in the vicinity. The focus is always on verified safe conditions for resuming work activities.