by 
HungryGuy
ANSWERS: 3
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Yes, but why would you want to? It wouldn't go very far, couldn't haul very much, and you'd always have to keep rewinding it.
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Also, a spring is not very efficient at storing energy, compared to gasoline or diesel fuel. Also, there is a question of safety. If fuel is left on its own, it will not do anything (ie explode). However, a wound up spring, if left on its own, would unwind instantly. In order to power a train, the spring would have to be wound up really tight. There would be thousands or millions of joules of energy stored in that spring. If, because of a mechanical failure, the spring were to suddenly unwind, it would be like a bomb exploding.
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Yes. But it would take Paul Bunyun to 'wind' it, and last seen he was wandering the back woods.
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