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Auto dispensing graphite stick lubricators lubricate the rail wheel flanges, reducing friction between the rail wheel flange and the rail. This permits the Shuttlewagon to negotiate tracks with high degrees of curvature.
Because the motive power of the Shuttlewagon is generated by the rubber tires against the rail lubricating the rail wheel flange is possible.
Obviously this unique solution to reduce shear forces and loss of pulling power generated by the rail wheels against the rail in track curvature cannot be employed by Railcar Movers that rely on their steel rail wheels for motive power. You cannot both lubricate against friction while trying to generate traction through the same rail wheel.
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