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The article is devoted to solving the problem of thermal stabilization of continuous welded rail using loop heat pipes. Critical temperature fluctuations on the ground during the year can create a problem of use of continuous welded rail due to the possibility of rails or rail-sleeper "ejection" at the maximum annual temperatures, rupture or breakage of the rails at the minimum annual temperatures. The practical problem of thermal stabilization of a continuous welded rail using heat pipes is considered in the above sources. During the summer operation of the railway track, due to the possible need to cool the rails during their critical heating, it is proposed to use loop heat pipes and geothermal cold of the subgrade or the soil of the lower structure of the track. Cooling with loop heat pipes in summer and heating them in winter maintains the temperature of the rails in an acceptable mode, protecting them from the "temperature" release of the rails or strings in the summer, or rupture in the winter at extreme temperatures of the continuous welded rail. In this study, a fundamental design of a thermal stabilization system has been developed and a calculation for regulating the temperature regime of rails of a continuous welded rail using loop heat pipes has been made. The technical result of temperature control of the superstructure of the track using loop heat pipes will be assurance of reliability and operability of the continuous welded rail at all possible temperatures. According to preliminary calculations, the control of the temperature mode of a continuous welded rail using loop heat pipes shall guarantee an acceptable temperature of the rails under extreme weather conditions. [ABSTRACT FROM AUTHOR]

The traditional approach to railroad tracks grinding is described. Limitations of existing technology of rails grinding is shown. A new approach to grinding of rails using concentric wheels is shown. Methodology of designing of concentric grinding wheels is given. [ABSTRACT FROM AUTHOR]

The article provides data on the grinding of rails by rail-grinding trains on the Russian and foreign railways. The disadvantages of rails grinding with traditional abrasive wheels are described. New designs of composite wheels for rails grinding are shown. The conducted operational tests of a grinding wheel with new design features showed high characteristics of both the wheel itself and the results of metal products treatment, in comparison with previous analogues. A program that allows the user to set the number of grinding paths and the accuracy of calculations as input data has been developed. After performing the calculations, the program provides the displaying of graphs of the initial splitting of the rail profile, graphs of the final splitting corresponding to the grinding paths of the removed metal. [ABSTRACT FROM AUTHOR]