PTV is really a thing of the past with much more reliance on private enterprise for all manner of travel infrastructure and services.
I suspect Trav meant PTV as an entity with employees. Or that was way I read it and I think that's right. I just meant it needs to come under the standard PT system.
The other thing with the train/tram/whatever is who are the users. Businessmen going home or to the airport from home? That's mostly taxis on the company card. Older people with suitcases, families with suitcases? They'd normally get someone to take them. Heck, I usually get the lift out to the airport from the far reaches; it is 2/2.5 hours on PT and Skybus (which would then be a train to the airport if it existed) or an hour in a car door to door. You put two people going to the airport in that car and it becomes less expensive, in most cases, than two $15 air train tickets. You put four people in a min-bus taxi and it is cheaper than air-train from city. Fit able-bodied tourists with hotels in the CBD or businessmen going from airport to office? Bingo. Is that enough? Not IMO for a standard rail fare to cover the cost of infrastructure. And I've never found the skybus, which the train/tram replaces, particularly occupied so are you going to get more on it if it is a train/tram at the same cost?
I'm not opposed to it, let's be clear. But I think it is a bad idea as a AUD15 skytrain or a standard fare if that standard fare can't cover the cost of the infrastructure or leave the tax payer with a massive bill.