DRC 4 is the route through Mongolia that connects the Russian Federation and the PRC. The corridor is the Trans-Mongolian section of the Trans-Siberian Railway. The direction of movement for bulk of the traffic is toward the PRC. All of DRC 401, 402 and 403 connect Mongolia-Russia border to the Mongolia-China border, via different routes. DRC 401 goes from Naushki (Russia) to Erenhot (China) via Ulaanbaatar. DRC 402 connects Erentei to Gashuun Sukhait in Mongolia. DRC 403 goes from Ereentsav to Bichigt.
Corridor trend or concept line