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In Union Pacific Steam by Kratville & Ranks, the authors state that UP 9000's as built had the exhaust from the center and one of the outside cylinders combined before going up to the smokebox. Some were modified by UP to make them seperate. Others were fixed when the engines got cast cylinders and sub-frames. I'm not sure about the SP 4-10-2's but they were all built by Alco and this could also affect the sound. <br /> <br />I've never heard a 9000, but always wished I could. I've pretty much assumed 'off-beat' refered to the difference between 90 and 60 degree engine designs. 3, 6, and 12 cylinder engines have a very distinctive sound compared to 4, 8, or 16 (for example an air-cooled 6 cylinder Porsche compared to a VW Bug 4 banger, or a 12 cylinder Ferrari compared to an 8 cylinder anything else). Maybe someone on the forum knows why(even vs. odd harmonics in the sound????)
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