TY JOUR TI MATHEMATICAL MODELS OF MODERN SHOCKABSORBING DEVICES OF RAILWAY ROLLING STOCKS KW absorbing device KW mathematical model KW classification KW cargo KW trains JO Transport engineering AU Boldyrev, A.P. AU Zhirov, P.D. AU Lagutina, A.A. AU Kravcov, S.A. AU Nikolay A., L.A. PY 2025 IS 2025 PB Bryansk State Technical University