From what I've read so far in the posts, I am leaning toward the pick up rollers. You say when it's in your hand it runs without issue. But when you place it on the track the problem starts. The fact that the pick up roller is being pressed on by the third rail leads me to believe that it's causing a short. The short doesn't show up until the roller is depressed. have you tried pressing the roller in while it's running in your hand ?
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