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The paper is devoted to investigation of influence of friction coefficient change on power interaction arising at passing of curved sections of a railway track by a freight train. The authors have got functional dependencies of longitudinal and transversal forces in «wheel — rail» contact from control of friction coefficient on the surface of rails at a number of variants of train velocities. In order to decrease the power interaction the authors propose to control friction on tread surfaces of the inner rail or both rails.

The paper considers a model of interaction between linear enterprises and counterparts. If a counterpart executes works in summer or winter period, it’s «orbit» may be represented in the form of ellipse or, depending on considered conditions, in the form of one of the half-hyperbola. Distance between the employer and the counterpart in this case characterize their mutual interest. If there are several counterparts, the model allows ranking them from the point of view not only business, but also personal interest of the customer.