Train conductor Yin Li (R) serves a passenger aboard the high-speed train G529, Feb. 1, 2019. Bullet Train G529/530 runs over 15 hours, the longest travel time of China's high-speed railway, between China's capital Beijing and Beihai of south China's Guangxi Zhuang Autonomous Region. The railway line covers a total length of about 2,675 kilometers. Train conductor Yin Li, a 30-year-old army veteran, is strict with himself and his colleagues. He inspects the bullet train G529/530 every day to ensure travel safety. (Xinhua/Xing Guangli)