TY JOUR TI MEASURES TO INCREASE THE RELIABLE AND SAFE OPERATION OF THE FREIGHT CAR TRUCK FRICTION UNIT 18-100 KW friction unit KW equipment KW cooling KW testing JO Transport engineering AU Fedin, V.M. AU Lipov, E.G. AU Ronzhina, Y.V. AU Korzhin, S.N. PY 2023 IS 2023 PB Bryansk State Technical University