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,
Ulan-Ude Okrug. According to the 2010 Census, 404,426 people lived in Ulan-Ude; up from 359,391 recorded in the 2002 Census. In terms of population, it is the third largest city in eastern Siberia. The ethnic makeup of the city's population in 2010: The city is the center of Tibetan Buddhism in Russia and the important Ivolginsky datsan is located from the city. Ulan-Ude is located on the main line (Trans-Siberian line) of the Trans-Siberian Railway between Irkutsk and Chita at the junction of the Trans-Mongolian line (the Trans-Mongolian Railway) which begins at Ulan Ude and continues south through Mongolia to Beijing