Surveyors from the Survey and Mapping Institute under China Railway Eryuan Engineering Group Co., Ltd. conduct surveys for the Sichuan-Tibet Railway on Zheduoshan Mountain in Kangding, southwest China’s Sichuan province, Feb. 18, 2020. Construction of the Sichuan-Tibet Railway, the second railway to go into Tibet, has been making steady progress. Recently, 47 tunnels along the Lhasa-Nyingchi section of the railway have been bored, laying a solid foundation for the operation of the section. (Photo/Zhang Wen)