Trans-Siberian Railway adventures. The railway is often associated with the main transcontinental Russian line that connects hundreds of large and small cities of the European and Asian parts of Russia. At a Moscow–Vladivostok track length of , it spans a record eight time zones. Taking eight days to complete the journey, it is the third-longest single continuous service in the world, after the Moscow–Pyongyang and the Kiev–Vladivostok services, both of which also follow the Trans-Siberian for much of their routes. The main route of the Trans-Siberian Railway begins in Moscow at Yaroslavsky Vokzal, runs through Yaroslavl, Chelyabinsk, Omsk, Novosibirsk, Irkutsk, Krasnoyarsk, Ulan-Ude,
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