 This article examines the causes of asymmetric modes in a traction drive system featuring direct torque control of a rolling stock with asynchronous traction motors. These modes are caused by the asymmetry of the supply voltage system, the asymmetry of the traction motor windings, and transient processes triggered by changes in the inverter supply voltage and variations in the traction motor load. Additionally, these modes can also be caused by the asymmetry of the feed voltage system and the traction motors winding asymmetries. These asymmetric modes can cause emergencies, which can be identified through the ratios of the amplitude of the phase currents and flux linkages of the stator. Furthermore, the effects of a variation in the feed voltage and load acting on the motor shaft on the starting characteristics of the phase currents and flux linkages of the stator are investigated when there are no emergencies present. When there are no emergencies, the ratios of the amplitude of the phase currents and flux linkages of the stator of different phases remain constant. Finally, the amplitudes of the phase current and stator flux linkage are used as diagnostic criteria for identifying and dying. This article was authored by Sergei Gulak, Boris Lobarski, Vyda's Lukosovishis, and others. We are article.tv, links in the description below.