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This is from memory, so I'm not 100% sure... <br />The first DD35 were booster units (I believe that EMD built a demonstrator set with two DD35 between two GP35, for a total of 15,000 horsepower, which is what Union Pacific's operating people thought they wanted). A year or two later, U.P. asked for some with operating cabs: they were called, to distingui***hem from the earlier B-units, DDA35. <br />When EMD introduced its "40" series of 645-engined models in 1966, the catalogued a DDA35 lookalike called either-- I don't remember which-- DD40 or DDA40. No sales. After a few more years, Union Pacific ordered a modified-- bit larger, wide nose, various technology updates that eventually went into the 1972 "Dash 2" line, engine rated at 10% more power-- version, which I'm pretty sure was called the DDA40X: DDA for a cab-equipped DD, 40 for its 16-645 engines, X for the new features ad semi-experimental status. They were delivered in 1969, the hundredth anniversary of the completion of the transcontinental railroad, so U.P.'s p.r. people dubbed them the "Centennial" class.
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