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The introduction of high-speed traffic in the railways of Ukraine is one of the priorityareas of development of the domestic railway industry. Foreign experience in the operation of highspeed and high-speed lines has a positive impact on the overall economic performance of thesecountries by increasing the mobility of means of production and human resources. In addition,increasing speeds requires the introduction of new types of rolling stock and railway structures withunconditional provision of the required level of safety. This is possible only through a comprehensiveapproach to these issues, both through experimental tests and theoretical calculations. This studytheoretically assessed the possibility of operating intermediate rail fasteners type KPP-5 Ukrainianproduction in areas where in the medium term, it is planned to increase speeds, i.e. to reach a levelof more than 160 km/h. To achieve this goal, multivariate calculations were performed to determinethe stress state that penetrates the elements of the railway track under the action of rolling stock.Four types of high-speed locomotives and electric trains, which have been operated on the railwaylines of the European Union for a long time, were selected as units of account in the study. For alltypes of rolling stock (locomotives and high-speed electric trains) for which calculations wereperformed, the obtained values of stresses acting in the elements of the railway track do not exceedthe allowable. That is, in terms of strength, intermediate rail fasteners type KPP-5 Ukrainianproduction can be operated in straight sections at speeds over 160 km / h with heat-treated rails typeR65 on reinforced concrete sleepers with laying diagram 1840 pcs / km with gravel ballast 40 cmthick. Analytical comparison of the level of stresses arising in the railway track elements in lines withintermediate rail fastening type KPP-5 made in Ukraine and the W30 rail fastening systemmanufactured by Vossloh showed approximately the same level of stress in the railway track elements.However, it should be noted that the above conclusions are only theoretical in nature and for thefinal determination of the possibility of operation of the intermediate rail fastening type KPP-5 inreal conditions (at speeds greater than 160 km / h) requires additional experimental studies.

Experimental and theoretical researches of influence of a condition of a profile of asurface of rolling of a wheel pair on level of horizontal cross forces of interaction between elementsof a rail track and a rolling stock in operation on the railways of Ukraine are carried out. We havefurther developed approaches to modeling the effect of different types of fasteners on track stability,as the rigidity of the rail thread is directly related to the design of subrail supports and rail fasteners.The main task of experimental research was to establish the actual state of the elements ofintermediate fasteners and reinforced concrete sleepers, finding the maximum resistance of the railto longitudinal movement, which are provided by fasteners under different operating conditions.Experimental studies of the elastic characteristics of the horizontal longitudinal characteristics of therigidity of rail threads were performed, the studies were performed at different times of the year.Experimental studies of transverse deformations of rail threads on the head and sole of the rails madeit possible to determine the exact characteristics of the horizontal lateral stiffness of rail threads forrails type P65 with different types of fasteners. The main experimental studies were conducted on aseamless track within the main sections of the railway. The elements of the intermediate rail fasteningduring operation are subjected to constant dynamic impact in the process of which there are residualdeformations.Based on the obtained data, calculations were performed to determine the horizontal lateralmodulus of elasticity of the railway track, to determine the longitudinal and transverse stability ofrail threads depending on the type of fastening. The obtained experimental and theoretical resultsallow to evaluate the force interaction of the rail track with the rolling stock.