I was trying to think of a locomotive that had them previousley, but could only think maybe a Pilbara import had them like the F7 (which I see does). Were there any other locos that used them ? Import 2nd hand or otherwise? It may be the first to have them overall (excluding the pilbara area which is isolated of course)
As well as the two F7s (which are both preserved) there are a number of USA built rail grinders that use Blomberg trucks, including Aurizon RG331 which was in Spencer Junction two weeks ago.
But this class should be the first new locomotives built for Australia with Blomberg trucks.
I would think that it has a new frame, since it is shorter than an MP15 (or even SW1504) but mainly because those frames would be too heavy (those locos are all about 120 tonnes complete).
Having been shown the photos earlier, note the deeper than normal windows on the non-driver side to improve visibility. The right side front window (as viewed) is also deeper. Some VR Y class have additional low windows on that side of the cab front.