Study of the friction of the brake shoe of a freight car Sardor Inagamov, Shukhrat Djabbarov, Bakhrom Abdullaev, Yadgor Ruzmetov, Kamoliddin Inoyatov and Yahyo Hurmatov E3S Web of Conf., 401 (2023) 05036 Published online: 11 July 2023 DOI: 10.1051/e3sconf/202340105036