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First of all,no one is seriously considering nuclear locomotives. Back in the fifties Westinghouse and some other companies actually were proposing such a beast. <br /> Secondly,you do understand that Hydrogen and Helium are totally different substances,right? The first is the most reactive element, the second is inert. Modern airships(blimps) use helium,which is why the Goodyear blimp can't go boom. As far as using volatile fuels like hydrogen or methane(natural gas),the fact that they are considerably more explosive than Diesel fuel is a concern,but just as gas heat for buildings has been made very safe,it will be possible to use them in transportation applications. Many utility companies operate fleets of methane fueled trucks,and you don't hear of catastrophes. <br /> As far as practical alternatives, there are plenty under development,it's just that right now economics favor diesel traction in North American railroading. <br /> The railroads are extremely interested in controlling costs,you could find many shippers who would disagree with your statement about efficiency. <br />
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