TY CONF TI PAST AND PRESENT OF THE ULAN-BATOR RAILWAY KW Ulaanbaatar railway KW history of development KW analysis of activities KW first railway lines KW railway communication KW car fleet KW interaction JO INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE "MANAGEMENT OF OPERATIONAL WORK IN TRANSPORT" (UERT-2022) AU Mendsayhan, G.. AU Nikiforova, G.I. PY 2022 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"