TY JOUR TI Stability of rail track geometry in transition sections KW railway track KW rail track KW rail track geometry KW stability of rail track geometry KW turnouts KW transition sections KW dynamic unevenness KW ballast KW crushed stone JO Bulletin of scientific research results AU Shehtman, E.I. AU Chernyaeva, V.A. AU Igoshev, I.S. AU Chuprynin, A.A. PY 2024 IS 2024 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"