If an object is waved violently by someone on or near the track, what should the train do?

When an object is waved violently by someone on or near the track, it typically indicates a potential emergency or situation requiring immediate attention. In this context, stopping the train is the most appropriate and safest reaction. By coming to a complete stop, the crew can assess the situation, ensure the safety of passengers and crew, and determine any necessary actions to address the cause of the signal.

This response prioritizes safety over continuing on schedule or just reducing speed, both of which could risk the well-being of individuals on or near the tracks. Signaling an emergency might be necessary, but it doesn't address the immediate risk as directly as stopping the train does. Therefore, stopping the train is the most effective and precautionary action in this scenario, ensuring that the safety of all involved is managed appropriately.