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Johnathan, While I'm not considering nuclear locos, I'm not sure about some of these other fellows. It appears they are willing to consider anything. Yea, you caught me on the hydrogen - helium thing. I was typing one thing and thinking another. I know that modern airships use helium because it is an inert gas. Some may not know that the Hindenburg was filled with hydrogen and that pure hydrogen (the kind used for fuel) is very dangerous. I made another comment about gas-electrics to illustrate that all kinds of fuel are being considered by the guys who design the things. My thesis still stands that the pros are doing all they can given the constraints they have to consider. Thanks for proofreading my other post. - Ed
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