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In this article the problems of efficiency of functioning of production systems of the locomotive repair enterprise are solved. In particular, the object of research is the technological processes of repair and maintenance of electric locomotives at the enterprises for repair of traction rolling stock. The article presents a mathematical description of the production process of such enterprises, on the example of the service locomotive depot «Moskovka». The mathematical model is described on the basis of queueing theory (QS) and Markov chains. A graph of the technological state of the locomotive during repair in the depot, where the process of transition of the repaired rolling stock from the state to the state, i.e. the relationship of technological movements of the electric locomotive on the territory of the depot, as well as the time of technological operations described transition matrix. The distribution of repair requests is described by the Poisson law, the delay of the electric locomotive in the depot areas in the planned types of repair in accordance with the accepted norm, and in the unplanned form of repair, the applications are delayed in accordance with the distribution of erlang. Based on the results of the mathematical description of the model of the production process of the repair enterprise, a simulation model of the operation of the Moskovka depot was created, implemented on a computer with the help of professional software of a new generation - AnyLogic. The paper describes the logic diagram of the simulation model, selected methods and modeling libraries. According to the results of the study, the overall assessment of technological performance indicators of the locomotive repair enterprise, in the conditions of probabilistic, dynamic changes in the repair task. By means of the methods of research of technological processes of depot «Moskovka» realized in article, it is possible to design any repair enterprises on repair of a rolling stock of the railroads, for the purpose of identification of «bottlenecks» of production process.

The contact line is a special kind of power overhead line with multiple electrical connections of wires, which form a complex topology of the linear electrical circuit. Analytical models simplify the real topology of the contact line and it limits their functional application. It is possible to take into account the topology of contact line when using tools of computer simulation, but it entails complicating the computational algorithms of the model. The aim of this article is to determine the conditions for the application of current distribution models and the development prospects in this area. The article describes the existing models for calculating the current distribution in DC contact line: a model of natural current distribution, linear analytical models, model with an infinite number of droppers, a model with a direct application of Kirchhoff's circuit laws in matrix form, and a finite element model. The article contains the main provisions and calculation capabilities of each model. Contact line KS-250-3 acts as a calculation catenary for the comparison of current distribution models. You can use the results of the article to select the optimal design distribution model for the design of the contact line, thermal analysis, current-carrying capacity calculation, identification and elimination of «weak point».

In the article the peculiarities and the advantages of using dynamic modes for diagnosing units of rolling stock. Specific examples of the diagnostics of separate units of the locomotive vibration, temperature, electrical parameters, frequency of rotation. The urgency of the task of developing diagnostic systems using the reference models.

The purpose of the work is to analyze and assess the structure of economic development and the impact of the «economic space» on railway transport in Uzbekistan, to consider the use of container block train technology. Scientific methods of analysis and synthesis, classification, mathematical statistics, economic analysis, mathematical technical modeling are used. The following results were obtained. The dynamics of the development of cargo transportation in Uzbekistan is assessed on the basis of GDP data. The volume of provided transportation and the use of modes of transport by the volume of shipped products is considered. Of these, the number of goods shipped in Uzbekistan from railway transport, the dynamics of the volume of transportation of certain types of cargo in containers. According to the dynamics of the growth of cargo transportation, a decrease in growth was revealed in 2020 and associated with the pandemic, but in general there are steady growth rates. It is concluded that along with the ongoing work on the renovation and reconstruction of railway tracks, it is necessary to take measures to optimize the entire chain of cargo transportation by containerization, so the use of block train technology. The practical significance of the results of the study follows from the fact that the analysis of the development of transport infrastructure revealed a sharp decline in the results of transport at the end of 2019 - 2020 due to the pandemic, but at the same time, there is a reduction in the «economic space» by improving transport infrastructure, simplifying transit and customs clearance procedures, increasing transit volumes and regional trade, therefore, the logistics transportation market in the republic will grow at an accelerated pace in the coming years. Mass use of containers with the use of block train technology, so. the collection of containers from the port rear terminals, where the formation of batches of containers takes place, and their accumulation in the volumes required by the buyer for transportation by rail can also be a solution to the identified problems.

In the article the issues on creation of branch of track width when changing it in the curved track with radius less than 350 m. Presented the existing methods of widening or narrowing the width of the track in the curves section of track. We propose a method of change of gauge in curved track is from 1520 to 1530 or 1535 mm. to the Proposed method of drainage of the track width is carried out by the existing structures of the elements of the superstructure. The proposed method of drainage of the track width gives a smooth fit of the rolling stock in curve track section and provides the requirements of the applicable standards.

One of the priority areas of economic development of the Far East Region is focused on the communications with the countries of the Asia-Pacific Region. The region is crossed by the largest railways, such as Trans-Sib and Baikal-Amur, which have an access to the Far East seaports that promotes the growth of international trade operations and the increase of the transit traffic in the region. An expansion of transport and economic relations of our country in the Far East Region, the implementation of a considerable number of extractive industry programs ​​ within Baikal-Amur Region, the development of the sea ports of the Far East Region will cause the growth of the workload on the rail infrastructure that is impossible without its development and modernization. An important role in the transport process belongs to the technical stations, which handle all transit trains traffic. Therefore, at the current state, the consideration of the aspects of choosing the rational variants of railway transit nodes’ development with allowance for the environmental factors is timely.