TY JOUR TI Theoretical and Experimental Studies of Intermediate Rail Fasteners KW Rail fastener KW elastic clip KW damping gasket KW dowel KW service life KW fatigue strength KW service life JO Bulletin of scientific research results AU Solomatin, E.V. PY 2025 IS 2025 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"