TY JOUR TI The impact of tariff policy and structural constraints on rail freight transportation dynamics KW rail transportation KW tariff policy KW throughput KW East Siberian Railway (ESR) KW Irkutsk Region KW logistics infrastructure KW structural constraints KW regional economy KW freight flows KW export reorientation JO Journal of Applied Research AU Golovan', S.A. AU Samsonova, A.P. PY 2026 IS 0 PB ITBO University