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I've seen the little Tenshodo SPUDs (it stands for Self Propelled Universal Drive), but these are powered trucks with a motor driving both axles through a worm drive system - If anyone's seen the old Tri-Ang mechanisms the design is very similar. SPUDs are handy when you want to motorize something without intruding into the bodywork - in the UK they're often used to power diesel and electric multiple units as they allow you to fit an interior. However, SPUDs have no flywheel and I suspect they wouldn't last long before burning out if you added the amount of ballast you would need to haul a decent length train!
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