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Trains of the future...
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I can see coal being the primary fuel of the future. It will be either a liquified coal derived fuel utilized in diesel or some other distilate engine driving a generator (as is done now), or it could be a coal fired steam turbine used to regenerate a set of energy storage devices, much like the Green Goat of today. Using supercapacitors, it would be possible to engender enough energy storage within a nominal locomotive housing to facilitate enough time to allow the fire for the coal boiler to be refired when needed to recharge the supercapacitors. Thus you can have the same turn on/shut off capacity for the coal fired steam turbine as you do with the gas turbine of the Green Goat (albeit with a much longer time interval). <br /> <br />It's also possible by then that on board nuclear power may become acceptable, rendering hydrocarbon fuels obsolete. <br /> <br />I don't see catenary being strung over the nation's rail grid, as that is a huge capital undertaking.
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