I bought a bachman HO E-Z track train set off craigslist. My 3 year old loves it. He wants to see it work so bad. I went to a hobby store and got a track pumice cleaner thing and did that. I set it up on the floor. The floor has carpet but is very thin berber type with no padding underneath. If I lift the back wheels off the track they spin like crazy and some sparks fly but when I put it back down it stops and won't move. Any advice would be great. Thanks.