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I agree that the advances will come in electronics. AC traction will become the standard as it does away with the commutator and brushes. <br />Railroads are a tough enviroment. Catenary may be strung on high traffic lines but something that generates its own power will be needed for secondary lines. <br />Turbines are good in theory but gulp a lot of air. Current advances in regulating the injectors of Diesels make them hard to beat. Any machine that operates off the high speed main spends most of its life idleling or in low power demands. Thats why switchers last forever. <br />My money is on a 4-cycle Diesel with advanced electronic engine control driving an alternator with AC traction motors. Such units could be produced today if RRs would part with a few pesos. They are a notoriously frugal bunch.
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