Slot Car Rides are theme park rides that are propelled by an onboard electric motor through a slot car track.
Disney developed the technology, first implemented in 1999, with Test Track at Epcot. Test Track was a success, and they followed it up with Journey to the Center of the Earth at Tokyo DisneySea and Radiator Springs Racers at Disney California Adventure.
References
Slot car ride Wikipedia(Text) CC BY-SA