Which of the following is not a required action when a new timetable is implemented?

The correct choice highlights that retaining the previous schedule is not a required action when a new timetable is implemented. When a new timetable takes effect, the focus shifts to the updated schedule, which introduces new times and possibly new routing or operational changes.

Maintaining the old schedule would be unnecessary and could lead to confusion for both employees and passengers, undermining the purpose of updating the timetable.

In contrast, adhering to previous rights, following new indications, and advising passengers of changes are all essential actions that ensure smooth transitions and operational integrity during periods of changes in service. These actions help in maintaining a consistent experience for passengers and ensuring that operational guidelines are followed properly.