when you say Australian shunting locos what did you have in mind, steam or diesel, and what state? there are some dedicated NSW shunters around -the 73 class comes to mind, I think there's also a X200 as well. In steam days, if a loco was specifically allocated for such, most NSW yards used the smaller tanks, ie 13, 20, 26 or 30, with the larger yards often using saturated 50 classes, all of which you would find on the dls. Not sure if there is much in payware for NSW