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To improve the reliability of the detection of a technical condition of the mechanical components of rail rolling stock and calculate the critical values of the parameters put forward the hypothesis of the homogeneity of groups of similar nodes mechanical electron-tropoezda. As part of an experiment to verify this hypothesis, carried out the collection of information about the values of vibration parameters of electric components in the movement; the technique and the statistical analysis of the measured vibration parameters for the same type of bonds-fishing.