Photo taken on Sept. 18, 2017 shows a train running on Lanzhou-Chongqing railway, in the Guangyuan section within southwest China's Sichuan Province.

Lanzhou-Chongqing railway, a major railway connecting Lanzhou City in northwestern province of Gansu with the southwestern metropolis Chongqing, will fully open to traffic on Sept. 29, 2017, according to a press conference held by Lanzhou Railway Bureau Thursday.

The railway, which started construction in 2008, also runs through northwest China's Shaanxi Province and southwest China's Sichuan Province. It will play a crucial role in improving transportation efficiency and advance the development program for western China.