Staff members work in a tunnel along the Qianzhangchang Railway (Qianjiang-Zhangjiajie-Changde) in Xianfeng County, central China's Hubei Province, Dec. 20, 2016. The Qianzhangchang Railway, which is designed to link southwest China's Chongqing Municipality with central China's Hubei and Hunan provinces, has a total length of 340 kilometers and is planned to come on stream in 2020. (Xinhua/Yang Shunpi)