Some are, some aren't. Apart from the Big Boy there ain't been a lot recently. Some of the smaller shortlines have associated HR operations I don't see too many heritage, but most are diesel.
Unfortunately seems to be the mainstay of other Australian based private rail freight operators. Even today Tasrail, how long has it been back in the hands of the govt and yet still no heritage trains have run.
I think you might find that the reason Geber didn't start running straight away was because G&W refused to allow any passenger traffic on the line - deeming it unsafe. He tried several times around 2005/6.
Adelaide Metro used to run a train of 3XXX class to the Barossa for the annual 'A Day on the Green' at Peter Lehmann's. They were refused permission by G&W ("We don't want passengers on our line.") at the last moment one year and had to cancel and run buses instead. Can't remember which year - but somewhere around 2004/6.
I wonder if in the litigious US, the private freight rail operators are so anti HR?
How many mainline accredited locos are there in Tasmania?
Diesel is certainly king!
For Tassie, today, no idea. others probably do but they used to have a few between the three groups. Used to be around 2 x X and 2 x Y class diesels plus 3 or so steamers, mostly M and MA class with C class used at Don for its own line work and at one points Dubs.
Problem now is that its been along time between drinks so whats still in service?
TTMS in Hobart is connected to a 20 km long branch line that is basically closed following relocation of Hobart inter-modal yard to Briton. So with only a few hundred metres of track would they maintain locos in mainline operating condition or rather static but preserved.
Derwent Valley had an X and Y DEL plus a H class steamer in longterm rebuild, I think its ready to go, but no track access approvals as the line they want to lease or lease is under control of the state, previously PN despite not being used by either since early 90's.
Don Valley, they have their 3km of track, but connection with mainline is I think currently disconnected following derailment in PN days. Again waiting on rack access approvals.
I left Tassie in 1998 and unknowingly caught some of the last mainline tours on a number of lines at that point.
You have to give credit to alot of the people who keep turning up to the sheds working on repairing/rebuilding/upgrading the fleet with no end in sight for mainline access.
Back to Baroosa, I stated my position previously on what should happen there and HR is not a key part of what I believe should be the rail future.