Trans-Siberian Railway of travelling in the comfort of "the tsar's train" across the unspoiled wilderness of Siberia. The tsar's train was designed and built in St. Petersburg to serve as the main mobile office of the tsar and his staff for travelling across Russia. On 9 March 1891, the Russian government issued an imperial rescript in which it announced its intention to construct a railway across Siberia. Tsarevich Nicholas (later Tsar Nicholas II) inaugurated the construction of the railway in Vladivostok on 19 May that year. The construction of the Trans-Siberian Railway was overseen by Sergei Witte, who was then finance minister.
Trans-Mongolian Railway line began in 1947, reaching Ulan Bator from the north in 1950 and the Chinese border in 1955. Before that the only railways in Mongolia had been a line (opened in 1938) connecting the coal mines at Nalaikh to the capital and a Soviet-built freight-only branch (completed in 1939) from Borzya on the Trans-Siberian Railway to Bayantümen, Dornod near Choibalsan in north-eastern Mongolia. Russian Irkutsk State University of Railway Engineering opened its Ulaanbaatar branch in June 2009. The Mongolian Railway company "Mongolyn Tömör Zam" carries 80% of all freight and 30% of all passenger transport within Mongolia. In the aftermath