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Dear GP40-2, Please clarify on what it is that I don't understand. If you would be so good as to point to a specific statement with which you have an issue, I'd appreciate it. As for the locomotive horsepower vs. boiler pressure: You yourself stated that the Big Boys had smaller piston strokes and diameters than other locomotives. In part, the larger force on the piston from the greater cylinder bore on the Yellowstone, and the greater Mechanical Advantage from the larger stroke on the Allegheny, made up for the decreased boiler pressure. Also, if you give an engine large (wide) steam ports and large valves, it will increase horsepower, as long as you have a boiler to match. Do bear in mind that the lower boiler pressure allowed the boiler to create more steam at a lower pressure with the same heat. The boiler would therefore be able to create more steam for the cylinders to use, whereas the Big Boys would need a slightly shorter cutoff. Sincerely, Daniel Parks
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