TY JOUR TI PROBLEMS AND METHODS TO IMPROVE AUTOMATIC COUPLING DEVICE OF FREIGHT CARS, TAKING INTO ACCOUNT THE PECULIARITIES OF THEIR OPERATION KW freight car KW device KW automatic coupling CA-3 KW shock absorbing device KW center sill KW safety KW transportation KW cargo JO Transport engineering AU Filippov, V.N. AU Sergeyev, I.K. AU Pishchik, A.V. AU Kurzina, N.M. PY 2024 IS 2024 PB Bryansk State Technical University