TY JOUR TI Assessment of the influence of irregularities and the model of the rail track on the dynamic qualities of a freight car KW freight car KW gondola car KW track model KW irregularities of rail threads KW simulation of carriage movement KW dynamic qualities JO Bulletin of scientific research results AU Bogdanovich, A.A. AU Saidova, A.V. PY 2024 IS 2024 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"