When does a new timetable officially replace the previous one?

The correct answer is that a new timetable officially replaces the previous one the moment it goes into effect. This is an essential aspect of railway operations, as timetables dictate schedules, train movements, and overall system safety. When a new timetable is issued, it is critical that all train dispatchers and railway personnel operate according to the new information to ensure coordination and compliance with updated schedules.

The moment a timetable goes into effect signifies that all trains, signals, and interactions across the network must adhere to the new parameters established in that timetable. This ensures that any changes in route, timing, or procedures are seamlessly integrated, enhancing the efficiency and safety of train operations. Prompt adherence to the timetable is vital for maintaining schedule integrity and ensuring all parties are aligned to the latest operational directives.