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The paper suggests an approach to determination of actual train operation parameters according to data from on-board measurement systems in order to increase efficiency of application of automatic electric motive power operation systems. The authors have analysed scientific works in the sphere of improvement of automatic electric locomotive operation. The paper also presents results of comparison of grade computations in KORTES and real data from on-board measurement systems on 2ES6 electric locomotives that operate on a section of the West-Siberian Railway. As a result, the authors have substantiated a possibility to apply data gained from on-board measurement systems in real-time mode for determination of such train parameters as tractive effort torque of traction motors, electric locomotive traction effort, external forces of train tractive resistance, reduced gross load hauled and etc. The approach to determination of train parameters according to data of current measurements allows increasing peculiarity of transmission of control actions and efficiency of an automatic train operation system.