Photo: Peoples' Daily/ Lei Sheng

BEIJING, Dec. 30 (Xinhua) -- Xi Jinping, general secretary of the Communist Party of China (CPC) Central Committee, stressed the significance of the high-speed railway line connecting Beijing and Zhangjiakou, the co-host city of the Beijing 2022 Winter Olympics, which went into operation on Monday.

Xi, also Chinese president and chairman of the Central Military Commission, said the opening marked new progress in the preparations for Winter Olympics and called for high-standard and high-quality advancing of related work.