TY JOUR TI PROBLEMS AND WAYS OF ENSURING THE SUSTAINABILITY OF THE RAILWAY TRACK IN THE CRYOLITHOZONE OF THE KOMI REPUBLIC: GEOGRAPHICAL ASPECT KW railway track KW permafrost zone KW perennial frozen rocks KW exogenous processes KW and deformations JO MOSCOW ECONOMIC JOURNAL AU Dmitry, O.S. AU Osadchaya, G.G. AU Saprin, S.V. AU Bykova, M.V. PY 2026 IS 0 PB Electronic science