Workers adjust a chair in Bijie Station of Chengdu-Guiyang railway in southwest China's Guizhou province, Dec 15, 2019. The 650-kilometer railway, an important part of the country's high-speed rail network, is expected to be in operation on Dec 16. (Photos: Xinhua)

Photo shows the Bijie Station of Chengdu-Guiyang railway in southwest China's Guizhou province, Dec 15, 2019. The 650-kilometer railway, an important part of the country's high-speed rail network, is expected to be in operation on Dec 16.

Workers clean the square before Bijie Station of Chengdu-Guiyang railway in southwest China's Guizhou province, Dec 15, 2019.

Aerial photo shows the Chengdu-Guiyang railway in Qingzhen in southwest China's Guizhou province, Dec 15, 2019.

Workers adjust chairs in Bijie Station of Chengdu-Guiyang railway in southwest China's Guizhou province, Dec 15, 2019.

A train runs in Qingzhen County during a trial operation of Chengdu-Guiyang railway in southwest China's Guizhou province, Dec 15, 2019.

Aerial photo shows the Chengdu-Guiyang railway in Qingzhen in southwest China's Guizhou province, Dec 15, 2019.

A train runs on Xiangbahe grand bridge during a trial operation of Chengdu-Guiyang railway in southwest China's Guizhou province, Dec 15, 2019.

A train runs in a trial operation of Chengdu-Guiyang railway in southwest China's Guizhou province, Dec 15, 2019.

Aerial photo shows the Chengdu-Guiyang railway in Qingzhen in southwest China's Guizhou province, Dec 15, 2019.