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I get the feeling whomever wrote that article might have initially thought the 4449 was a coal burning loco. It makes no sense to test for oil for a period, then convert to coal and test again, sounds like they may have re-written the article once it was done to cover their ***. Steam locos only get a small operating ratio when it comes to fuel burned/energy released. It doesn't matter what it burns, the new diesels will always be more efficient and cheaper to run. Always nice to dream though.
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