A trial train of Chongqing Subway Line No.3 runs on elevated rail in southwest China's Chongqing Municipality, Dec. 28, 2010. The subway line, with the highest speed of 75km per hour, started its trial run on Tuesday. It will be formally put into operation in June of next year. [Xinhua]

A trial train of Chongqing Subway Line No.3 prepares to depart from a station in southwest China's Chongqing Municipality, Dec. 28, 2010. The subway line, with the highest speed of 75km per hour, started its trial run on Tuesday. It will be formally put into operation in June of next year. [Xinhua]