My Uncle is planning a trip to Australia. He wants to use the train as much as possible. He plans to fly into Cairns. Do some day trips from there, then travel down to Sydney, over to Adelaide and then up to Darwin. He will have stop overs along the way and side trips. His questions is, Does he have to purchase a "rail pass" or just buy a ticket on each train? What does the "rail pass" do for him? Thanks a lot , I really appreciate your help with this.