As and when the XPT finally gets replaced on the main south line from Sydney to Melbourne, I imagine a tilt train will be the logical replacement. I am using the Brisbane to Cairns diesel tilit train as an example for this thread. It can run 6 - 8 cars (average weight of around 45 tons each) and each power car weighs 64 tons and produces 3600hp, so 7200hp for the entire set.
So I am wondering what time saving can be achieved? I assume a maximum speed of 160kph in southern NSW, as the XPT already does today. The current timetable is for an 11 hour trip at best.