Energy-efficient power regulators for electric railway vehicles Leonid Astrakhantsev, Natalya Ryabchyonok, Tatyana Alekseeva, Andrey Khomenko and Aleksey Martusov MATEC Web Conf., 216 (2018) 02001 Published online: 17 October 2018 DOI: 10.1051/matecconf/201821602001