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Dapper Russian Road Switcher
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<p><span style="font-family:verdana,geneva;">Following what Paul said, I offer this about the span bolsters:</span></p> <p><span style="font-family:verdana,geneva;">The shorter the rigid wheel base of each truck, the sharper the curves that can be negotiated. In order to permit this locomotive to negotiate tight curves, it uses a pair of individual B trucks at each end rather than one D truck having a continuous truck frame and rigid wheel base. </span></p> <p><span style="font-family:verdana,geneva;">If you study the geometry of using four independent trucks under a locomotive, you can see that you cannot simply attach each truck to the locomotive frame with its own pivoting bolster bearing. Each end of the locomotive can only have one pivotal truck attachment point. So the pair of individual trucks has to attach to that one pivot point on the locomotive frame. </span></p> <p><span style="font-family:verdana,geneva;">At each end of the locomotive: the span bolster is used to bridge the two independent trucks and then the center of that bridge attaches to the locomotive frame. The span bolster has a pivot bearing at each end on its bottom which rides atop the center pivot bearing of each truck. The span bolster also has a pivot bearing at the center of its top which attaches to and suports the single pivot bearing of the locomotive frame.</span></p> <p><span style="font-family:verdana,geneva;">So the span bolster pivots on the locomotive frame, and the two trucks pivot on the two ends of the span bolster.</span></p>
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