We do have *(SYD)* Western Sydney/Sydney Western Airport coming in a few years time.
Wonder how that is going to work, reading OP's link.
The new airport will probably cost millions.
So how is that going to work?
Move VAi and partners and freight to the new airport at Badgerys Creek, and leave QF and OW at Mascot?
Edit:
New airport, fed and NSW state govt share the cost.
Might also have a gate fee when the train gets to it.
But there will be many opportunities for cost recovery, hundreds of vending machines, hundreds of stores, so many travellers paying the various security and other airport levies, ...
For Kangarooflyer88, we need a VFT for that route.
Can't have a suburban pax line, as the train will be ultra crowded, look at the current train from Central to Mascot Airport, no baggage hold area, mix of suburban pax and dom and int travellers, and its not well announced on the pa that the train has 2 stops at the 2 separate dom & int airport terminals, ...
Not sure what would happen if an int pax got off at the wrong terminal at the airport train station.