Aerial photo taken on Dec. 7, 2018 shows a branch base of PowerChina Sinohydro Bureau 3 Co., LTD (Sinohydro 3), a Chinese engineering company engaged in the construction of the China-Laos Railway in northern Laos' mountains. The China-Laos Railway will run more than 400 km from Boten border gate in northern Laos, bordering China, to Vientiane with an operating speed of 160 km per hour. The project started in Dec. 2016 and is scheduled to be completed and open to traffic in December 2021. (Sinohydro 3/Handout via Xinhua)