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Qube UD Quon [P577] - B-Train Shipping Container Configuration by Andrew Priest, on Flickr
Qube are one of the major transport operators operating out of Fremantle Port. I assume P577 had dropped off two containers and was leaving preparing to leave the Port. I am not 100% sure but this looks like a B-Train or B-Double configuration which allows the operator to pull two shipping containers in the metropolitan area.