The paper describes the method for determining the position of the contact wire of electrified railways using microwaves. The method is based on the triangulation system of two georadars and allows to determine a contact wire zigzag and height from the rail head. The proposed method is all-weather with the possibility of continuous monitoring of the overhead contact wire in plan and profile with the opportunity to automate the processing and signaling abnormalities.

Keywords: railroad contact line, contact wire location, GPR, automatic control systems

The article depicts test results of ballastless track system roadbed stressed state. In-situ tests of roadbed vertical stresses were held considering rolling stock type and speed. Roadbed vertical stress distribution dependence was carried out.

Keywords: Roadbed, ballastless track system, RHEDA 2000, vertical stress damping, stress distribution

The paper studies the possibility of quantitative processing of the GPR data for determining the dielectric permittivity and conductivity of a medium (soil samples). Experimental studies are made using radargrams of soil samples with specified values of moisture and conductivity. New methods of quantitative processing of radargrams are proposed in this work to determine the dielectric permittivity and conductivity of soils. The methods were successfully tested on various sections of Russian railways net.

Keywords: layered road profiling, GPR, soil moisture, soil layers profiling, soil conductivity

  The work is devoted to the development of an intelligent system for monitoring high railway embankment, which allows to analyze its condition and make early solutions to manage the safety of vehicles. The main features of the system and its difference from known analogs is taking into account the dynamic effects of vehicles on a high embankment at different climatic conditions. This paper describes the main stages of building the monitoring system, which includes: selection of objects for monitoring, computer modeling of the interaction of the rolling stock and a high embankment, the algorithms required for the development of management decisions. 

Keywords: high embankments, risk assessment, destruction, monitoring, computer modeling, intelligent system.

The work is focuses on the determination of the attenuation factor of electromagnetic radiation when applied in soils with different physical properties as a criterion for assessing the depth of Ground-penetrating radar (GPR) method. The measurements were performed using a tunable coaxial resonator which frequency range coincides with one normally used in the practice of GPR. The attenuation factor of a sample of soil placed in a cavity is determined by the shift and width of the resonance line. Advantage of this method is the preservation of soil structure during the measurement.

Keywords: ground-penetrating radar, properties of soils, attenuation factor.