Guo Shengqiang (1st L) and Luo Lulu (2nd L) stand on an aerial work platform at a section of the Qinghai-Tibet Railway in Hairag Township of Gangcha County, northwest China's Qinghai Province, Feb. 2, 2021. Guo Shengqiang and Luo Lulu, both 23, are workers responsible for the repair and maintenance of the overhead line system of a 118-kilometer section of the Qinghai-Tibet Railway. Though younger than other colleagues, they are already adept at the working routine as railway maintenance workers. (Xinhua/Zhang Long)