All of these other suggestions are good and better than a 9V battery, it's just a walkie talkie and a screwdriver were easier to get ahold of. For the time being. And he runs fine it's just his on off switch didn't go down far enough to fully engage his gear causing the train to skip. My solution was to take out the spring, duct tape down the gear and put him back together. He now works perfect, except for the fact now he doesn't freeroll.
Proud owner of Tomy/Plarail trains. 