Determination of rail deformations using fiber optic technologies Konstantin Izotov, Daniil Loktev, Alexey Loktev, Baktybek Karimov and Alexandra Salnikova E3S Web of Conf., 389 (2023) 05045 Published online: 31 May 2023 DOI: 10.1051/e3sconf/202338905045