Hi all - so I pulled out all my old stuff - been in the attic about 20 years and found 8 locomotives. I've tried to get each one to run and got the following results: Some just did nothing at all, some sputtered a bit and ran VERY slow, almost like they were not getting enough juice, and a few that actually ran. Questions: I cleaned up the wheels the best I could by using a 320 grit sand paper. Is there a better method and better product besides sand paper? The engines that are just not getting enough power and just putting around the track, are they just washed up and ready for 'display' or is there something I can do to bring them back to life?