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<p>[quote user="mbinsewi"]It was designed so that everyone that wanted a big locomotive could have one, and still work on a tighter radius.[/quote]</p> <p>Just to complement your post I link to a photo on the TCS website that shows the construction of the underframe: <a href="https://www.tcsdcc.com/Customer_Content/Installation_Pictures/HO_Scale/Athearn/Gas%20Turbine/Gas%20Turbine%20(4).JPG">https://www.tcsdcc.com/Customer_Content/Installation_Pictures/HO_Scale/Athearn/Gas%20Turbine/Gas%20Turbine%20(4).JPG</a></p> <p>It shows an Athearn gas turbine, but the U50 got the same kind of bolster connecting the two trucks on each side. The swivel point is the center of the inner truck making weigh balancing very difficult.</p> <p>The OMI U50 has all axles driven. The truck connecting bolster swivels around the mid point between the two truck centers as on the prototype: <a href="https://www.picclickimg.com/00/s/ODUzWDEyODA=/z/z78AAOSwgv5ZeOV8/$/OVERLAND-MODELS-OMI-67111-HO-UNION-PACIFIC-UP-VERANDA-_57.jpg">https://www.picclickimg.com/00/s/ODUzWDEyODA=/z/z78AAOSwgv5ZeOV8/$/OVERLAND-MODELS-OMI-67111-HO-UNION-PACIFIC-UP-VERANDA-_57.jpg</a></p> <p>It is a photo of a veranda turbine. It was the only one I was able to link directly.</p> <p>Brasstrains.com OMI U50D photos require some browsing through the thumbnails: <a href="https://www.brasstrains.com/classic/Product/Detail/041552/HO-Overland-Models-OMI-6421-1-UP-Union-Pacific-U50D-Diesel-37">https://www.brasstrains.com/classic/Product/Detail/041552/HO-Overland-Models-OMI-6421-1-UP-Union-Pacific-U50D-Diesel-37</a></p> <p>Regards, Volker</p>
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