@Mike CT posted:The Horizontal motor, and drive shafts, from the fuel tank, are much different, from the basic, two vertical can motor drive system, most are familiar with. One of the last 6 axle offerings was the SD9. A very nice model. IMO, Mike CT
Edit/Add: Also note, that even though this model is three rail, the wheel flanges are not proto-typical three rail (large flanges), that inhibit de-rail, on tight curves. IMO, Mike CT.
If the drives are the same and the drive is forcing the trucks off of the tracks in 2 rail and the flanges are the only thing keeping them on the tracks in 3 rail, then that would suggest binding of some sort and not desirable in either case. The range in which the trucks can negotiate freely should be the same in both.
Fixed pilots, couplers and 3 axles per truck stand out to me, also. Sunset rightly seems to cover their butts on what they say any model can negotiate.
