I recently found two older trains i had like about 10 years ago, and got into this hobby again. I don't much about it, but it is a dc train, an n scale, and looks like an old steam train. I cleaned the track and tried to clean the wheels, but the wheel don't look dirty, just a silver color. My problem is when it place it on the track it hardly moves at all, I have to kind of push it on its side for it to make a good contact with the rails but it won't go on it own, i really want to make this work, anyone have any ideas?