Yeah I love train trips myself and we don't have too many over here, but what we do have are very unique journeys, though desert and rainforest, along the coast and over the mountains, so hopefully one day you'll be able to experience ours.
For example, we have the Indian Pacific from Perth to Sydney via Adelaide and Broken Hill and a few others too.
Then the Ghan which goes from Adelaide straight up the centre to Alice Springs and the Savannahlander which goes north from Brisbane up through Queensland to lots of places https://savannahlander.com.au/tours/
https://www.journeybeyondrail.com.au/
Hopefully one day you'l get to come over here and check these journeys out!