Do you mean seen one? or actually built(made). If that's the question.....my second 9000 class build in G gauge is under way. A combination of plastic, and brass. I start out with Trashed New Brights, hours of cutting, lots of Styrene, PVC, glues and brass accoutrements, then paint, piping, railing and countless lost hours of leaving the house. Then it starts all over again with the tenders. So far I have built two Big Boys, challengers and working on the next 9000. Sold one at a show last year in Washington for $400.00. Not much over the investment and tiime, but still a return. Although these are actually operational, they are rather rigid to navigate any short radius. The Big Boys flanges were removed from the inner drivers one motor actually drives the loco's rear drive truck. The challnegers have two motors driving those 12 wheels. The 9000's are single motor driven with power transfered through all 12 wheels.