TY JOUR TI FATIGUE TESTS OF SOLEBARS AND BOLSTERS OF FRIEGHT CAR BOGIES KW frame KW bolster KW car bogie KW testing KW viscosity KW magnetic powder control KW microstructure KW macrostructure KW strength KW resource JO Transport engineering AU Komarovsky, N.V. AU Otoka, A.G. AU Gegedesh, M.G. PY 2025 IS 2025 PB Bryansk State Technical University