TY JOUR TI TRENDS IN THE DEVELOPMENT OF THE ARCHITECTURE OF THE METRO (1823-2000) KW metro architecture KW metro planning structure KW metro architectural concept KW architectural trends KW architectural principles and methods of the metro JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Bratischev, A.K. PY 2021 IS 6 PB Belgorod State Technological University named after V.G. Shukhov