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Steam locomotive valve gear
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Young valve gear was predicated on the premise that since the drivers on one side were 90 degrees from those on the other, why not drive the valves on one side from the motion on the other, and eliminate the eccentric cranks. It was a worthy idea but its translation into reality was complicated, with a lot more wear points than other gears. <br /> <br />There is no bell crank in the valve gear; the motion from one side of the engine (taken from the crossheads) drove, through transverse shafting, the valve on the other side. Connected to the crossheads by long union links, the Walschaerts-style links functioned the same as those on a regular Walschaerts locomotive; the radius rods from the links drove rockers located on the ends of the transverse shaft (there were inner and outer shafts on a rod and sleeve arrangement). Lead motion was taken from the top of the links and transmitted to a combination lever located on top of the rockers. The valve rods were connected to the combination lever. <br /> <br />UP still has a 2-10-2 - the 5511, I think - that's Young-equipped. It was located in Cheyenne the last time I was there, which was about 30 years ago. <br /> <br />There were CP Pacifics with Young gear and probably some other examples, but none come to mind just now. <br /> <br />Old Timer
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