Twincity, I knew of one of those machines in New Zealand in the 1950's.It had been left behind after WW2, prob. ex US Army. It was known as a "Speeder center drive" so must have been a product of "Speeder shovel Co before they joined up with "Linkbelt". From memory it had a 4 cylinder "McCormick-Deering" engine. The trackgear was very poor but the rest was good. I didn't think I would ever see another, not in this day and age. Grab it, its worth preserving.