A method is proposed for non-contact indication of the presence of operating voltage in disconnected sections of an alternating current contact network, based on the properties of liquid crystals and the effect of electrical influences. A procedure is given for selecting voltage indicator parameters when used on single-track sections of a traction network. The possibility of using sign-synthesizing liquid crystal indicators to create contactless indicators without an internal power source to indicate the presence of operating voltage in sections of the contact network is shown.

Keywords: AC contact network, single-track section, disconnected section, operating voltage, non-contact indication, liquid crystal indicator, properties, equivalent circuit, selection of parameters

For the design, construction and monitoring of railway infrastructure facilities, as well as for the maintenance of track facilities, it is necessary to have a spatial database relevant at the time of their production, which should be provided with a continuous survey of infrastructure facilities located in the right-of-way. The article considers the possibilities of introducing geoinformation technologies, including high-precision methods of coordinate-time support, mobile laser scanning, into the production processes of design, construction, operation, repair and diagnostics of railway infrastructure. The existing problems of the widespread introduction of mobile laser scanning technology in relation to the shooting of railway objects are shown.

Keywords: geoinformation technologies, high-precision coordinate system of JSC "Russian Railways", mobile laser scanning, geodetic support

The current trend of complication of the modes of operation of the traction power supply system, an increase in the amount of damage from events leading to downtime of trains, the need to improve operational efficiency, actualizes the task of using monitoring systems. The features of the traction power supply system determine the requirements for the organization of monitoring parameters in real time. One of the main requirements is to ensure the autonomous operation of monitoring devices (systems) for a given period of time. Using the example of monitoring the process of ice formation on a contact network, taking into account the specifics of disturbing environmental influences, the basic principles of building a monitoring system, the structure of technical means, a multi-mode algorithm of functioning, a method for calculating the parameters of a power source are proposed.

Keywords: power supply system, contact network, monitoring, ice detection, automation