A bullet train attendant offers service to passengers during a test run from Xi'an to Yan'an in northwest China's Shaanxi Province, June 26, 2012. Operation of a CRH bullet train service between Xi'an, the provincial capital, and Yan'an, once the headquarter of the Communist Party of China (CPC), will start on July 1, following a successful test run on Tueday. The new train service will shorten travel time between the two cities to 2.5 hours. [Xinhua]