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The article describes the main provisions of the optimized system of the electric locomotives maintenance service and repair, as well as the results of the experiment to increase between-repairs run of the electric locomotives in the Eastern polygon. The author examines the impact of techno-logical preparation of production on the quality of repair and the number of failures in the transi-tion to a more streamlined system. The article proposes a method of calculation of adjustment and development cost of technological documentation, which is an integral part of technological prepa-ration of production. The cost calculation includes qualifications and salaries of industrial engi-neers, the complexity and volume of developed or adjusted technological documentation. The author gives the example of calculation of adjustment and development cost of technological docu-mentation in depot conditions. The economic effect from the implementation of this methodology and optimized system repair shows its effectiveness and viability. Due to the adjustments of techno-logical processes of the electric locomotives repair, the number of failures during operation, dis-covered during the experiment in the Eastern polygon, will decrease. Benefit from the increased between-repairs run and reducing the complexity of some of the repairs will cover the costs of im-plementation of the optimized system.

In the article it is developed a model for the locomotives life cycle managing in their maintenance and repair using automated technical diagnostic systems. Based on statistical analysis of data on the operation of locomotives, the impact of the reliability of the locomotive and its maintenance and repair system on the efficiency of locomotives is theoretically justified. A method of analyzing the technical diagnostic systems effectiveness using the mathematical apparatus of information theory and of predicting the duration of maintenance and repair time with the dynamic use of accumulated statistics on the duration of previous repairs has been developed.

The factors affecting the operational reliability of the assembly platform of a rail service car maintaining the repair and installation on the railways are considered in the paper. An assessment and analysis of a system of quantitative indices of reliability is performed, the methods for their separate determination by mechanical equipment and hydro and electrical equipment is described. The strategy of maintenance and repair combined with the use of methods and means of a modern diagnostic system is considered; it ensures the estimation of the object reliability during its design, operation and repair.