TY JOUR TI MATTERS OF LOAD DECREASE IN TRACTION DRIVE UNITS AT BOXING KW electric locomotive KW crew section KW traction drive KW friction self-oscillations KW vibro-shock processes KW suspension KW boxing JO Bulletin of Bryansk state technical university AU Kosmodamianskiy, A.S. AU Shevchenko, D.N. AU Zhirov, P.D. PY 2021 IS PB Bryansk State Technical University