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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.