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Yellowstones vs Big Boys
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Marty, I mislead you a bit, I apologize. You didn't have a blond moment. A true Yellowstone type uses the four-wheel trailing truck to support a large firebox. SP's first cab-forwards really needed the four-axle truck for better curve-following qualities because there was so much weight cantilevered past the driving wheels that now entered a curve first instead of last, as it normally would. Had these been normally oriented, the early designs would surely have been 2-8-8-2s.
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