I bought a Athern Loco on e-bay and then I picked up a digitrack decoder today. The guy at the shop told me to bring it to the show tomorrow and he would show me how to install it but being the hard headed .... that I am I decided to do it myself. Now remember this is the first time that I've ever even taken a screw out of a loco. I got the decoder installed and everything put back together but when I put it on the track the wheels spin, it moves a few inches then stops. It's almost like something is dragging but that is not the case. It was running fine on just DC before now. i didn't see any traction rubbers on the wheels when i took it apart. ???