The basic data necessary for calculations when performing control work are presented. Brief theoretical information, basic provisions from the theory of oscillations, examples of drawing up differential equations for simple mechanical systems. are given. Design schemes for the carriage part of cars are considered depending on their design. It is intended for students of the 2nd - 4th years of the specialty "Moving stock of railways" full-time and part-time forms of education , "Dynamics of rolling stock" , May be useful for students of other specialties , the educational program of which includes this or other disciplines with similar content of the studied material according to the work program of the discipline.