The article discusses the problem of increasing the energy efficiency of the 3 kV DC traction power supply system on the railways of the Russian Federation. As one of the ways to amplify it, the authors consider a system of contactless automatic voltage regulation under load of converting units of traction substations, where reactor controlled devices serve as the regulatory body. As one of the directions for improving the system, the use of thyristors in the design of a controlled device is proposed. The article presents the functional diagrams of contactless automatic voltage control systems with thyristor-reactor and thyristor controlled devices, shows the external characteristics of the converter unit with these systems. To calculate the economic efficiency when introducing contactless automatic voltage control systems with reactor, thyristor-reactor and thyristor controlled devices, a methodology has been developed based on calculating the savings in reduced costs, as well as the payback period when replacing a contactless automatic voltage control system under load with a reactor controlled device by a system with thyristor-reactor and system with thyristor.

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The paper considers ways of increasing the traffic capacity of railway sections equipped with automatic block signaling systems, with a discrete variable number of block sections. Simultaneous traffic of long and short trains on a single block is analyzed. The paper highlights shortcomings and limitations of the existing automatic block signaling systems, including low traffic capacity and non-compliance with traffic safety requirements for railway sections. The study is aimed at removing these shortcomings and limitations. For this purpose, a reasonable technical solution has been presented, analyzed and scientifically grounded. System analysis techniques have been used to study the performance of traffic control devices.

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