TY JOUR TI Energetic Efficiency Rise of “Yermak” Family Freight Electric Locomotives by Modernization Approach During Plant Repairs KW freight alternating current electric locomotive KW traction system KW energetic efficiency KW electromechanical processes KW capacity losses KW computer modeling JO Bulletin of scientific research results AU Mustafin, A.S. PY 2022 IS 2022 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"