Improving the energy efficiency of power transmissions of a rolling stock on the basis of dynamic anisotropy of frictional contactVladimir Shapovalov, Petr Shcherbak, Pavel Kharlamov, Tatiana Sajamova and Denis RyabyshE3S Web Conf., 104 (2019) 01002DOI: https://doi.org/10.1051/e3sconf/201910401002