I am hoping for a German decapod also, saw the real things double headed on log trains back in the late 60's. There were more than one class of the 2-10-0's....off the top of my head I think there were the BR-44 and BR-52 classes in addition to the BR-50's, and I'm pretty sure there were others. Any of them would be fine with me. Maybe Steinzeit can elaborate.
BTW, Lionel had some brass 2 rail German decapods made (I think in the 90's). Only a few were made, maybe only 75 total. Why they made these, I don't know.