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Steam locomotive valve gear
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daveklepper - <br /> <br />N&W used Baker exclusively after the delivery of the Z-1 2-6-6-2s in 1912. There are railroads that didn't like Baker because it was patented and they had to buy it from the Pilliod Company. Poor old Egide Walschaerts' patent ran out in the 1800s, so anybody could design and build examples of his gear for free. <br /> <br />N&W didn't like Walschaerts because of the link blocks; they had some 4-6-2s and 4-8-0s built in 1907 with an unfortunate design of Walschaerts which aggravated link block wear. <br /> <br />The Southern Railway was the opposite, replacing Baker on everything that had it except 0-8-0s and 2-8-8-2s. They claimed that Baker tried to go into reverse at high speeds. N&W ran as high driving wheel RPM as anybody, and never had that problem. <br /> <br />Old Timer
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