TY JOUR TI Improving the calculation method for catenary contact suspensions of electrified railways KW contact network KW contact suspension KW carrier cable KW maximum temperature mode KW wire heating temperature KW traction power supply systems JO Bulletin of scientific research results AU Agunov, A.V. AU Ivanov, D.D. PY 2024 IS 2024 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"