What should occur if a train encounters a sliding wheel?

When a train encounters a sliding wheel, stopping the train immediately is the correct course of action. This response is crucial because sliding wheels can indicate a loss of traction, potentially leading to wheel damage, flat spots, or other safety hazards. Stopping allows for an assessment of the situation by the crew, ensuring an investigation into the cause of the sliding wheel—such as weather conditions, track problems, or mechanical issues—can be conducted before proceeding further.

Choosing to continue at a reduced speed or notifying the crew while keeping the train moving does not address the immediate safety concerns associated with sliding wheels, as these approaches could exacerbate potential issues. Ignoring the problem altogether poses a significant risk of accidents or further mechanical failures. Thus, stopping the train allows for the safety of both passengers and crew, minimizing the risk of accidents and ensuring proper safety protocols are followed.