In this article the urgent problem of improving the quality of repair of railway rolling stock main components and parts is considered; safety, life and health of passengers directly depend on these serviceable conditions. At the same time an important factor is a necessity of reduction of the cost of repairs. During periodic repair of cars often it becomes necessary to complete replacement of a particular unit or parts and procurement for this purpose of new very expensive, and in some cases no longer manufactured parts. Therefore, the restoration of parts by welding with further processing to drawing sizes allows to get cheaper and without reducing the strength characteristics the item practically identical to the new. The object of the research in this article selected the most important parts of the passenger car bogie – the roller and rod of the central spring suspension, in the operating process subjected to the greatest static and dynamic loads. are considered The existing requirements of normative-technical documentation for repairing the selected parts are considered. In this paper in steps the technology used on railroad car repair enterprises to repair parts with a description of the equipment used is described. For the research from the selected parts of metal samples are taken in the loaded areas. During the work sample preparation was carried out for further research using high-precision equipment of the RTU technical laboratory. Then, metallographic analysis of the roller and rod base metal and hardfaced metal was performed. The comparison of the standard requirements demanded to chemical composition of the base and the hardfaced metal to the actual chemical composition of the new parts and after surfacing was carried out with following graphical display of the results. Based on the results appropriate conclusions were written.