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The possibility of using mutual damping of assembly units of a freight car by a grouping of mating parts based on a shift in the frequency of resonances and self-oscillations of the groups being formed, and especially when the train passes by the curves of the railway track, including small radius and mountain pass sections, is considered. Particular attention is paid to the applied use of the theory of simple and complex oscillatory systems with access to a certain design solution to ensure the normative level of traffic safety and the positive implementation of the technical and technological resource of railway rolling stock.

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