Zhao Ling, the chief conductor of a train on the Chengdu-Chongqing high speed railway, patrols the platform at Rongchang North Station, Southwest China's Chongqing municipality, as the train is stopped at the station, on Feb 9, 2017. Although still in her twenties, Zhao has been a senior chief conductor for eight years and a mother to twin boys. [Photo/CFP]
Zhao helps her colleague adjust her silk scarf, Feb 9, 2017. [Photo/CFP]
Zhao checks the first aid kit on the train, Feb 9, 2017. [Photo/CFP]
Zhao's family celebrates her birthday at home, Feb 8, 2017. [Photo/CFP]