TY JOUR TI Analysis of the prerequisites for the creation of a mathematical model of the functioning of automatic couplings of loaded traction units KW coal industry KW traction unit KW motor dump car KW longitudinal-dynamic reactions JO Proceedings of Petersburg Transport University AU Ripol'-Saragosi, T.L. AU Ripol'-Saragosi, L.F. AU Yaickov, I.A. PY 2024 IS 21 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"