ChatterBank2 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.Its basically clockwork. When you pull the car back, one axle winds up (tightens) a spring, via some gearing, like turning the key in a clockwork mechanism. When you let go, the spring releases the energy back to the axle as it unwinds and the car is propelled.
I think there may be some sort of clutch and flywheel mechanism too but I'm not sure.
Try this site . It doesn't have the best diagrams, but it might help.