- Oak Park to Melbourne Central
- Oaklands Junction to Melbourne Central
- Oakleigh East to Melbourne Central
- Oakleigh South to Melbourne Central
- Oakleigh to Melbourne Central
- Ocean Grove to Melbourne Central
- Officer to Melbourne Central
- Olinda to Melbourne Central
- Ormond to Melbourne Central
- Melbourne Airport to Melbourne Central
- Melbourne Central to Oak Park
- Melbourne Central to Oaklands Junction
- Melbourne Central to Oakleigh East
- Melbourne Central to Oakleigh South
- Melbourne Central to Oakleigh
- Melbourne Central to Ocean Grove
- Melbourne Central to Officer
- Melbourne Central to Olinda
- Melbourne Central to Ormond
- Melbourne Central to Melbourne Airport