Importance

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Abstract

A railroad car truck includes a bolster mounted cross-wise between a pair of sideframes, with the sideframes supported on wheelsets. The bolster and the sideframes are steel castings. The interface between the sideframes and the wheelsets may include self-steering apparatus. Friction dampers are mounted at the interface between the bolster and the sideframes. The friction dampers have non-metallic friction surfaces that bear against the sideframe columns. The sideframe columns may be of a width for single dampers contact; double-damper side-by-side contact; or double-dampers separated by a land contact. The sideframe column bearing surfaces are permanent, and may be formed as part of the sideframe castings. The sideframes do not have removable, replaceable wear plates. Where double dampers are used, the damper edges may have both primary and secondary damper wedge angles.

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First Claim