On April 13, 2017, a worker is processing steel at the construction site in the mountainous area of northern Laos' city of Muang Xay, where a tunnel of China-Laos railway project undertaken by China Railway International Group locates. China-Laos railway is the first overseas rail project mainly invested by China, co-operated by both sides and connected to Chinese railway network. The railway applied both Chinese specifications and equipment. (Photo by Xinhua News Agency)