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The article deals with the analysis of the modes of operation of shunting locomotives; characteristics of the setting characteristics of the traction generators when performing resistance tests of locomotives. The statistical average values of the load parameters of diesel generator sets of shunting locomotives TЭM2 in the process of performing shunting work on marshalling and precinct stations. When monitoring the external characteristics of the locomotive when performing resistance tests with the ASKI "CYPRESS" was observed of the external characteristics of a normal ("classical") and "convex" shape. Normal (classical) external characteristics of the locomotive TЭM2 No. 1 equidistant removed from the borders of the tolerance field; and "convex" external characteristics of the locomotive TЭM2 No. 2 , in the field of tolerance, support of the constancy of the power diesel generator sets, due to the imperfection of the machinery of the regulatory system, particularly the Electromechanical characteristics of the pathogen.