The specificity of the definition of governing parameters of the equations of motion in the tasks of traction security is the lack of traction characteristics, data on the amount of the mass of an electric locomotive.In the work of the proposed solution to this problem at the expense of input in the relative weight of the locomotive and the use of universal traction characteristics obtained for the electric locomotive with collector traction motors and DC pulsating current, as well as with asynchronous traction drive. As a result of the proposed analytical expressions for determining the principal of specific resistance movement and maximum tractive characteristics for all of the zones of the power of the main types of traction drives.Proposed analytical dependence for determining the mass of an electric locomotive. The analysis of which showed that the main parameters determining the mass of the locomotive with fixed mass ended, are follows: type of traction drive and the acceleration of the train with starting speed.The main feature of the obtained expressions for determination of the parameters of the equation of motion is that they do not include the mass of the composition and of the locomotive. It gives the opportunity to the solution of the problem based on the results of traction calculation.
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