Keith, all this is from a book by Stephen Taubert that I've had for a few years. Stephen has collated all the Australian orders relating to vehicle markings from General Order No. 289, of 1903 to Order A9905/1/5 of Mar 82! It certainly covers some vehicles. Lang Kidby
tells us that it's out of print now, but Cliff
has bought the CD . I'd recommend contacting Stephen for a copy.