Railway worker Liao Chenggen patrols the Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen is on duty at the refuge recess of the Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen records the on-duty log at the refuge recess of the Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen (L) and group leader Luo Changwei check the railway condition in the Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen works in Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen collects garbage from Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen (L) and group leader Luo Changwei check the railway condition in the Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen checks the railway condition in the Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen watches a running train in Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen reports service performance by phone in Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
Railway worker Liao Chenggen checks the railway condition in the Dengshan tunnel in Hechi, south China's Guangxi Zhuang Autonomous Region, Jan. 30, 2021. Four workers from China Railway Nanning Group Co., Ltd. patrol the 773-meter-long tunnel in rotation every day to ensure the safe operation of trains running through it. (Xinhua/Zhang Ailin)
