Hi, I can't figure this out. I set up a simple oval on the dining room table (HO scale), but my locomotives won't work. I have three from various old sets and can't get them to work consistently. One doesn't do a thing, one runs sporadically (seems fine during some sessions but won't work at all during others), and one doesn't seem to want to run if both carriages are touching. If I lift one end, it seems to work fine. But when I put both on the track, nothing. I've tried cleaning the track and locomotives with rubbing alcohol and q-tips to improve my conductivity but this doesn't seem to solve the problem. I have new track I bought today (Bachman nickle silver EZ track). Seems I have some sort of electrical problem but I'm too inexperienced to know what it is. Thanks for any help you can provide.