Requirements for check-rail switch joints

The paper is devoted to a problem of passing of rolling stock wheelsets with minimum deterioration of a crossing joint of a switch. The authors have formulated criteria representing necessary and sufficient requirements, on the basis of which it is possible to determine permissible values of check-rails wear and dimensions of their gutters. The paper also presents a method for calculation of rolling stock passage on the crossing joint equipped with check-rails that are not connected to running rails. With the u se of the experimental and calculation method the authors have highlighted stages for determination of stress-strain condition of check-rails. The have analysed the operation of check-rails made of RK special profiles that are mounted to a running rail by inserts. As a result, the authors have assessed the advantages of application of check-rails with mounts that are not connected to running rails. Since the method of check-rails calculation for the operation in other parts of the switch is similar, they have analysed the operation of a protector checkrail for switches and discussed the efficiency and disadvantages of its application.