Step 1: Network Route Design.
Initial transit operation planning involves defining the network, specifically the routes, stops, and service areas.
Step 2: Timetable Development.
With routes established, the subsequent step is timetable creation, encompassing frequency, headways, departure times, and synchronization.
Step 3: Vehicle Scheduling.
Following timetable finalization, vehicles are optimally allocated to various routes.
Step 4: Crew Scheduling.
In the final stage, crews (drivers/operators) are assigned according to vehicle schedules, labor regulations, and shift requirements. \[\boxed{\text{Correct sequence = Network Route Design → Timetable Development → Vehicle Scheduling → Crew Scheduling}}\]