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One of the main tasks of optimizing the periodicity of maintenance operation and repairs is to obtain an economic effect with the preservation of high reliability of rolling stock equipment. To obtain an economic effect, it is necessary to conduct an investigation all possible factors affecting the operation of rolling stock under specific operating conditions. Their influence has a direct impact on the reliability of rolling stock.

The article is devoted to the definition of rational overhaul runs equipment of locomotives. This has an impact not only on the reliability of the rolling stock, but also on safety. As a method chosen for the implementation of this task, the functions of the failure rate are used, with the subsequent construction of the functions of resource distribution and determining 90 % of the resource of the equipment of electric locomotives. The proposed technique allows you to determine the rational timing of maintenance and repair of locomotives in the specific conditions of their operation. The calculations are based on information about changes in the technical condition of the wheel-motor block of VL10 electric locomotives.