Under what circumstance can a train run ahead of schedule?

A train can run ahead of schedule only when it is ordered to do so by proper authority. This is crucial for maintaining safety and operational integrity in train operations. Proper authority refers to designated officials or dispatchers who have the jurisdiction and knowledge necessary to issue such directives. This ensures that any changes to the schedule are coordinated with all relevant parties and that safety protocols are adhered to, minimizing risks associated with running ahead of schedule.

Circumstances based on passenger requests, visibility conditions, or the operator's personal confidence do not meet the necessary regulatory and operational standards for altering a train’s schedule. Passenger requests could lead to disruptions and are not within the safety protocols for train operations. Good visibility alone does not address other important factors such as track conditions, signaling, or potential interference with other rail traffic. Similarly, the train operator's subjective feelings do not constitute a valid reason for changing the schedule, as operational decisions must rely on established procedures and authority rather than personal judgment.