The SD70 runs fine and I did put in a Digitrax DH163D decoder. I have the UP SD70 and it runs Ok as I like the higher top speed for my long runs, but it has that worm-drive sound at a low crawl that I have gotten used to. Tried the Labelle 106 grease, but still there. I was pulling 25 cars(mainly 50' box cars) with it a few minutes ago and it has a slight wheel spin, while my Atlas was on the outside line and was pulling the same amount but with 89' auto carriers,trailer loaded flat cars,Well cars and 17.6K tank cars but with no problems. I bought mine locally for 90 bucks at the lhs minus decoder. The 163D has the ditchlight seperate from the directional light and was pre-assigned to function 1. It was east to install as it had the white flat quick plug DCC connector. I did not have to replace the whole board like my other Genesis(F3's).