I have one of the Mantua 2-6-6-2's with tender, DCC and sound. It came that way, so I'm not sure whose electronics are in there. It is in the Great Northern paint scheme, which isn't exactly correct for the Burlington Route, although the "Q" inherited some Mallet's from the GN, classifying them as T-1's. (In reality, the Mantua model is really a logging loco, and a little...not too much...small for a T-1. I don't run it much, but haven't had any trouble with derailments, except once when the lead truck derailed on an Atlas Snap Switch, leading into a 15" radius curve. I had to replace that turnout as it was the subject of a lot of derailments of steamers and four-axle diesels as well. My only "complaint" is that for a GN articulated, they don't have the twin cross-compound air pumps on the smokebox front.