Su Song and Seoul Metro Consortium of South Korea has been selected to build an underground railway in Ulaanbaatar. The railway will have two main lines. One, from the western part of Ulaanbaatar to Amgalan, will cover 28.3 km, and the other, from the 17th secondary school to Buyant-Ukhaa, will be 21.3 km long.

Initially 3 or 4 trains will run along the track that would be over the ground in suburban areas. A total of 40 stations would be built, at a distance of between 800 meters and 1 km between one another. Tickets would be priced similar to bus tickets.
Construction is likely to begin in 2013 and completed by 2017.