Trans-Asian Railway trade routes. UNESCAP's Transport & Tourism Division began work on the initiative in 1992 when it launched the Asian Land Transport Infrastructure Development project. The agreement formally came into force on 11 June 2009. The Trans-Asian Railway system will consist of four main railway routes. The existing Trans-Siberian railway, which connects Moscow to Vladivostok, will be used for a portion of the network in Russia. Another corridor to be included will connect China to Korea, Mongolia, Russia and Kazakhstan. In 2003, the president of Kazakhstan proposed building a standard gauge link from Dostyk (on the Chinese border) to Gorgan in
Trans-Siberian Railway from one side and then exit China and return to Russia on the other side) on this branch, it is still used by several international passenger services between Russia and China. The third primary route is the Trans-Mongolian Railway, which coincides with the Trans-Siberian as far as Ulan-Ude on Lake Baikal's eastern shore. From Ulan-Ude the Trans-Mongolian heads south to Ulaan-Baatar before making its way southeast to Beijing. In 1991, a fourth route running further to the north was finally completed, after more than five decades of sporadic work. Known as the Baikal Amur Mainline (BAM), this recent extension departs