Rail is used extensively in UK from transporting rubbish from major cities to landfill sites. There is a very large facility at Calvert (Oxfordshire, IIRC) that receives multiple trains per day, from as far away as Bristol.
Smell - need to locate away (or downwind) from population centres. Leigh Creek works; Crisps Creek works; not sure about the geography of Traralgon.
Pollution of groundwater. Calvert is located in an old clay pit, which offers good protection for aquifers. The underlying clay enables leachate to be recovered. Leigh Creek rainfall is sod-all per annum. Traralgon is rather wet - might need to line the landfill first.
Recovery of decomposition gases. Calvert has many gas well, collecting gases for electricity generation. Gippsland has existing grid connections that may well give advantages. Leigh Creek less so on this test.
I do wonder why government in this country hasn’t done more work on rubbish disposal/reclamation. Perhaps it has been done, but not widely publicised.
And then there is plastic- one of the worst inventions ever ☹️