TY JOUR TI Ways to Improve Hydrological Efficiency of Railway Subgrade Drainage KW Subgrade KW poorly permeable soils KW drainage KW infiltration KW rainfalls KW groundwaters KW timeframes for draining KW geotextile material KW geomembrane KW predicted inflow KW water balance KW predicted sufficiency JO Proceedings of Petersburg Transport University AU Kanciber, Y.A. AU Shtykov, V.I. AU Ponomarev, A.B. AU Vasil'eva, M.A. PY 2022 IS 19 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"