The Korea–Russia Friendship Bridge is a rail bridge over the Tumen River. It was commissioned in 1959 as a replacement for a temporary wooden bridge. Located immediately downstream from the China–North Korea–Russia tripoint, the bridge is the sole crossing point on the 39.1 km long North Korea–Russia border. Planks are laid between the tracks making crossing of road vehicles possible by special arrangement, but it is primarily a rail bridge. The tracks are dual gauge because the Russian railroad system uses a track gauge of 1,520 mm while the North Korean system uses 1,435 mm. The bridge is served by the Khasan railway station on Russian soil and Tumangang Station on the North Korean side of the river.