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I admit that I spent a lot of the way wondering why the Queensland trains don't travel South to Sydney. They're much more comfortable than the New South Wales trains. The answer, at least according to Wikipedia, is that Queensland mostly uses a narrow gauge track, whereas New South Wales uses the "standard gauge", so standard gauge track does go as far as Brisbane, but the nice Queensland trains all run on narrow gauge. Queensland also has a 4000km Sugarcane tramways network that keeps crossing the main track. Sugarcane was everywhere in North Queensland.
The scenery definitely became more and more tropical as we went North. There were plenty of Cranes, magpie geese, wallabies, Jabiru storks, ibis, pelicans, kangaroos, buffalos, eagles and hawks along with banana plantations, mango trees everywhere and lots of termite mounds in the fields. Definitely a very relaxing and enjoyable journey.