When should a dispatcher restore a switch to normal based on train crew reports?

The correct answer reflects the urgency and importance of maintaining safety on the railway. Dispatchers are responsible for ensuring that switches are in the correct position to prevent accidents and ensure the smooth operation of train movements.

When a train crew reports that a switch has been set to an abnormal position, it is crucial for the dispatcher to respond immediately. This means that as soon as they are informed, they should take action to restore the switch to its normal position without delay. This prompt response helps maintain the safety of current and future train operations by ensuring that the switch is properly aligned for the next scheduled train movements.

In contrast, the other suggestions do not prioritize safety in the same way. For instance, waiting for a period of time before restoring the switch could lead to further complications or unsafe conditions. Allowing time to pass may introduce unnecessary risks if another train is approaching. Similarly, waiting for the next train to pass before taking action could jeopardize the safety of that train. Lastly, scheduling the restoration of the switch for the next inspection fails to address the immediate need for safety and responsiveness prompted by the crew's report. Timeliness in these situations is critical, and acting immediately is the best approach to ensure operational safety.