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My gut instinct says that steam will make a comeback as railroad motive power.  The first hint was the ACE project.  Although it seemed to have died, these things do move slowly.  It did represent a reconsideration of a trend that the mainstream dared not question.  Surely the rising price of oil is sowing the seeds of another reconsideration.  Stranger things have happened.  Caterpillar has just unveiled their latest innovation:  A diesel-electric D7 dozer. 
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