Research of reliability of urban electric transport system A.E. Auhadeev, R.S. Litvinenko, V.P. Fandeev, P.P. Pavlov, V.M. Butakov and A.R. Litvinenko E3S Web Conf., 124 (2019) 05078 Published online: 10 February 2020 DOI: 10.1051/e3sconf/201912405078