From the article:
"The trains are controlled by the company's remote operations centre in Perth. ...
Autohaul locomotives are fitted with on-board cameras that are constantly monitored from the operations centre."
It sounds like the locomotive controls can be manipulated from a remote location if necessary, with the ability to "see" the tracks ahead (and perhaps sides and rear as well) on remote video.
I wonder how many grade crossings there are on that line, and how many towns the trains pass through. My guess is -- next-to-none, or none at all.
BTW, the engines in the pic at the source article were built by GE (probably in Erie, PA).