How long can schedule no 2712 be in effect?

Schedule no 2712 can be in effect for a duration of 12 hours. This is consistent with operational rules that dictate the maximum duration for which a specific schedule can apply without needing a revision or re-evaluation. Understanding the limitations of such schedules is crucial for maintaining compliance and ensuring that operations are conducted smoothly and safely. In practice, having a defined timeframe helps in planning and coordinating train movements, crew assignments, and resource allocation efficiently.

The other options suggest durations that either exceed the operational limits or do not align with established protocols regarding schedule longevity. Recognizing the parameters set by the operating rules ensures adherence to operational standards and supports the effective management of train services.