As already mentioned above, Sydney's night time network is not only a heavy rail replacement.
They have three kinds of all night services:
1. Night Rider - this is the rail replacement, running 7 nights a week.
2. Regular routes from city - This includes routes to places like Bondi, Manly, Coogee, Parramatta, Castle Hill, Epping - May run 7 nights or just Fridays and Saturday's depending on route.
3. Feeder routes from Parramatta - these run on Friday and Saturday nights, to places like Castle Hill and Chester Hill.
Sorry, I did read what you wrote - promise!
Even so, the NightRider rail replacement service would be the main backbone of the all night transport system to all parts of Sydney - I would be guessing that the regular services mentioned would all be Sydney Buses (i.e. government run buses) services? If so, then only available in Sydney Buses areas. In much the same way that most of the decent bus services after the end of the evening peak were those in (former) MMTB areas and the all night services were all MMTB routes prior to when they were discontinued? Did any private operators in Melbourne run all night services?
Even with your clarification of what Sydney does, I still don't think our NightRider should be changed to a rail replacement service as proposed above earlier in this thread. In fact what I said actually conforms to what Sydney does with targetted routes operating all night but without the rail service replacement and with the current NightRider network. I wouldn't be too surprised if Sydney would have done what we did if they had not had a historical all night suburban heavy rail service to replace, and supplemented it with all night regular routes as you have outlined. I can't imagine the Carlingford NightRide bus would be the most well used route on the network, nor the most direct compared with something running up Victoria Rd or running from Parramatta to Epping / Hornsby via Pennant Hills Rd. I don't recall much at Epping but Parramatta and Hornsby are certainly busy enough places at night having spent many a night at the Hornsby RSL in my younger days...
