I cleaned the track, I cleaned the wheels and the GP18 is still running very jerky. On the other hand my Life Like SW9 runs very nicely so I suspect a faulty GP18. I removed the shell, and put it onthe track again, but the problem is still there. If I press slightly on the top of the chassis it runs a few inches than stops as soon as I release the pressure. I then took a tweezer and move a little the 2 long contact strips running along each side of the chassis ( are they made out of brass ? ). I didn't bend them , just moved them a little toward the inside.Then the loco runs a lot better for at least 2 hours. I tried it again this morning and it still runs fine .What should I do to fix that problem permanently ? See the pic. It's not the pic of my loco ( I didn't take it apart , just removed the shell ) Just to show the part I moved slightly. Is there any way to clean that contact ? The Life Like assembly instruction sheet doesn't mentions anything about cleaning those 2 contacts. tia for any suggestion. B.T.