TY JOUR TI Wave-shaped depreciation of rails on tram transport KW tram KW wave-shaped wear KW rail corrugation KW grinding of rails KW milling of rails KW track maintenance JO Bulletin of scientific research results AU Dudkin, E.P. AU Homyakov, Y.S. AU Kakovko, D.A. PY 2024 IS 2024 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"