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I've been doing a little research, and in the 30s they used to use air powered locomotives in the mines to pull the stuff out. It was great at the time because it eliminated problems of safety and fumes the ICE had, and it pumped fresh air into the mine with it's exhaust. The french company claims 100km per fill up, thats a lot better than the 25 miles I get out of my electric Fiero, and I have to wait 6 hours to charge the batteries back up.
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