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Work collector-brush assembly largely affects the operational reliability of the DC traction motors. The article presents results of the simulation of contact interaction «brush-collector» in the 2ES6 electric locomotive traction motors. Reviewed influence of the design features of the brush holder, conditions and modes of operation on the quality of switching traction motors. On the basis of theoretical and experimental studies offered recommendations to improve the quality of contact «brush-collector» and to ensure the operational reliability of the traction motors.