I presume about here.
-32.74128534475666, 151.56157931571826
https://goo.gl/maps/gVmNP2Bcx5TQ1qLj7
Australia, and NSW in Particular, often has 4 track mainlines , in places where I thought the number of trains did not warrant it. in Fact , a quick scan of the tracks in the above link, I can't see a train on any of the tracks, though don't know what time of day it is . Possibly it is to allow passenger trains to pass long coal trains.
I'm not really a steam fan , so can't answer your other questions.
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Rail travel & trip reports
The only train trips I regret are the ones I didn't take.