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 2021 PB Bryansk State Technical University