TY JOUR TI Experimental Research of Energetic Efficiency of Electric Locomotive Asynchronous Traction Drive at Changing Load KW Electric locomotive KW asynchronous traction gear KW energetic efficiency at changing load KW energetic efficiency indicator experimental and calculated definition JO Bulletin of scientific research results AU Zarif'yan, A.A. AU Kolpahch'yan, P.G. PY 2023 IS 2023 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"