Gorobets, V.L., Bondarev, O.M. and Skoblenko, V.M. 2014. OPERATION CHARACTERISTICS OF ELECTRIC TRAINS ER1, ER2 BEYOND DESIGNED SERVICE LIFE. Science and Transport Progress . 6(54) (Dec. 2014), 119–127. DOI:https://doi.org/10.15802/stp2014/33760.