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