TY JOUR TI Refined Test Procedure for the Parking Brake of Freight Cars KW Car testing KW parking brake KW retention by the parking brake KW brake linkage KW car brake calculation JO Proceedings of Petersburg Transport University AU Zverev, M.V. AU Komaydanov, A.A. AU Smirnov, A.N. PY 2023 IS 20 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"