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Determination of frictional condition of the running surface and side surface of the top of rail (lubrication) that ensures the best interaction of the rolling stock wheels and the rail, reduces the force action and thus ensures the track stability and reduced side wear of rails in the curved tracks is relevant for all the rail net.The objective of research is to determine the influence of frictional condition of the track rail surfaces on the interaction forces in the “wheel/rail” contact with various motion parameters (speed, radius).The theoretical and experimental methods were used in the research. The theoretical methods include multioptional computer modelling of axial and lateral forces that appear in the curved tracks during the freight train movement in the software package “Universal Mechanism”. The modelling results were processed with the use of correlation and regression analysis. The experimental methods include full-scale measurements in the existing track and results processing.According to the research results, the theoretical algorithms for assessment of influence of the running surface lubrication on the forces. The option of frictional condition of the wheel and rail interaction surfaces has been established to ensure reduction in the operating expenses for surfacing and rail replacement, energy costs for haulage of freight train.

The article presents a study to assess the impact of the introduction of heavy-weight traffic on the main forces of interaction arising in the «wheel-rail» contact zone while a freight train is in motion along curved sections of the railway track. Mixed traffic is used on domestic railways, but there are no dedicated specialized lines for the operation of high-speed passenger and freight traffic with increased axle load. In this case, the possibility of the track infrastructure becomes decisive. Improving the operational efficiency, first of all, of track facilities, is impossible without scientifically based methods. The qualitative operation of a track depends on the forces arising from the interaction of the wheel-rail pair. This paper presents a study of the force interaction of the contact zone with an increase in the axle load on one of the sections of the Sverdlovsk railway. Horizontal transverse lateral and longitudinal forces are considered by means of simulation modeling. Since the introduction of heavy-weight traffic is caused by the change in the traction characteristics of a train, the article presents the results of work on the study of influence of the train driving mode on the forces under consideration.

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The paper is devoted to investigation of influence of friction coefficient change on power interaction arising at passing of curved sections of a railway track by a freight train. The authors have got functional dependencies of longitudinal and transversal forces in «wheel — rail» contact from control of friction coefficient on the surface of rails at a number of variants of train velocities. In order to decrease the power interaction the authors propose to control friction on tread surfaces of the inner rail or both rails.