Which of the following is the least important reason for a train operator to remain on schedule during rush hours?

Remaining on schedule during rush hours is crucial for ensuring that the entire transportation system operates effectively and efficiently. The reasons outlined in the choices illustrate various consequences that can arise from deviating from a set timetable.

The choice indicating that a train ahead of schedule must be held at time points is considered the least important reason because the primary focus during rush hours often revolves around overall punctuality and the flow of the service rather than the specific actions taken with one train. While holding a train at a time point may seem significant, it is a strategy employed to prevent further disruptions to the schedule and maintain uniformity across the system. The other factors—such as the necessity of a train making additional stops or the potential delays caused to subsequent trains—more directly influence passenger experience and operational efficiency. Maintaining punctuality is indeed essential, as it affects ridership satisfaction and the overall reliability of the transit service.

Thus, while option B highlights an important operational procedure, it is less critical in the larger context of rush hour operations than the other considerations.