TY JOUR TI Designing a Modern Catenary System KW Catenary system KW catenary suspension KW carrier cable KW contact wire KW wire heating temperature KW sag KW carrier cable tension JO Proceedings of Petersburg Transport University AU Agunov, A.V. AU Ivanov, D.D. PY 2025 IS 22 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"