Alright I bought 3 of these years ago from the Swap Meet area, and 2 of them have never run correctly. One is really good and quiet, the other 2 make a kind of grinding noise, one worst then the other. Do I need to just order NEW motors and trucks for them? I want to finally get them working correctly so I can run all 3 of them. I am a little confused as to what motor to Buy as there is two of them on their parts site? Any help appreciated? https://shop.atlasrr.com/c-908-n-classic-u25b-locomotive-parts.aspx I want the entire assembly for both motors and trucks as I don't want to have to mess with small parts right now. But I want to get them working finally at this point.