File photo taken on May 8, 2009 shows a passenger train passes through 109 tunnel of the Baoji-Chengdu Railway in northwest China's Shaanxi Province. [Xinhua]
File photo taken on Aug. 1, 2008 shows a bullet train runs through the Yangcun Bridge of the Beijing-Tianjin Express Line in north China's Tianjin Municipality. [Xinhua]
