Tibetannet

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)

Guo Shengqiang (L) and Luo Lulu (C) are briefed safety instructions by a senior worker 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)

Guo Shengqiang (L) and Luo Lulu climb onto an aerial work vehicle 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)

Combo photo taken on Feb. 2, 2021 shows Luo Lulu (L) and Guo Shengqiang posing for photos before work (top) and during the break (bottom), in northwest China's Qinghai Province. 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)

Luo Lulu (R) and Guo Shengqiang work 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)

Guo Shengqiang checks her tools 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)

Guo Shengqiang (L) and Luo Lulu patrol 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)

Luo Lulu climbs up a pillar of the overhead line system 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)

Guo Shengqiang (L) and Luo Lulu check security equipment for each other before work 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)