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Interesting topic - I have to say I didn't look at it this way... Anyhoo RailroadDoc: it has been done - with super high pressure locomotives. Overall it proved no significant improvement at a cost of high complexity. http://www.dself.dsl.pipex.com/MUSEUM/LOCOLOCO/locoloco.htm As for modern steam. No way - not possible. Even at 21% efficiency it is woefully inefficient in comparsion to ~40% efficiencies of current coal power plants - with them having prospects to go as high as 50% or more. If you want a modern steam driven loco - it looks like this: http://www.dansk-jernbanearkiv.dk/eg3101.jpg
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