 the transportation system in mongolia consists of a network of railways, roads, waterways, and airports. ==railways==   the trans-mongolian railway connects the trans-siberian railway from ulan ude in russia to erenhot and beijing in china through the capital ulan bator. the mongolian section of this line runs for 1110&nbsp;km.montsame news agency. mongolia. 2006, isbn 99929-0-627-8, p. 93 a spur line connects darkhan to the copper mines of erdenet; another spur line connects ulaanbaatar with the coal mines of baganuur. a separate railway line exists in the east of the country between choibalsan and the trans-siberian at borzya; however, that line is closed to passengers beyond the mongolian town of chuluunkhoroot.lonely planet mongolia: choibalsan transport for domestic transport, daily trains run from ulaanbaatar to darkhan, sukhbaatar, and erdenet, as well as zamyn-ÃÃ¼d, choir and sainshand. mongolia uses the  (russian gauge) track system. the total length of the system 1,810&nbsp;km.lonely planet mongolia: rail transport in 2007, rail transport carried 93% of mongolian freight and 43% of passenger turnover (in tons*km and passenger*km, respectively).2007 statistical yearbook of mongolia, p. 252 ==roadways== in 2007, only about 2600&nbsp;km of mongolia's road network were paved. another 3900&nbsp;km are graveled or otherwise improved. this network of paved roads was expanded to 4,800&nbsp;km in 2013, with 1,800&nbsp;km completed in the last year alone.http://ubpost.mongolnews.mn/?p=7086 this included the roads from ulaanbaatar to the russian and chinese borders, paved road from ulaanbaatar to kharkhorin and bayankhongor, another going south to mandalgovi, and a partly parallel road from lÃ¼n to dashinchilen, as well as the road from darkhan to bulgan via erdenet. the vast majority of mongolia's official road network, some 40,000&nbsp;km, are simple cross-country tracks."status paper on road sector of mongolia"mongolia's statistical yearbook 2007, p.255 construction is underway on an east-west road (the so-called millennium road) that incorporates the already existing road from ulaanbaatar to arvaikhee
Transport_in_Mongolia