By trawling the Internet, as you can on every subject.
The above trains to/from Merbein, however, aren't QUB ones, they're Pacific National but QUB will still benefit as it hauls a lot of agricultural produce by rail. As one example, it has a busy siding at Harefield (between Wagga Wagga and Junee in NSW on the main Sydney-Melbourne line) and also has another busy depot at Griffith NSW with much produce railed down to the port of Melbourne and exported.
QUB also has in excess of 800 trucks/articulated road vehicles last I read, so it's truly multi-modal and on top of that there's its ports interests.
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