Platelayers work at a subway car depot of subway Line 1 in Xi'an City, capital of northwest China's Shaanxi Province, Aug. 28, 2012. The rail laying of subway Line 1 is expected to be completed on Wednesday, and the 25.36-kilometer-long subway will be put into service in September of next year. [Xinhua]

A worker cleans up rails at a construction site of subway Line 1 in Xi'an City, capital of northwest China's Shaanxi Province, Aug. 28, 2012. The rail laying of subway Line 1 is expected to be completed on Wednesday, and the 25.36-kilometer-long subway will be put into service in September of next year. [Xinhua]

Platelayers work at a construction site of subway Line 1 in Xi'an City, capital of northwest China's Shaanxi Province, Aug. 28, 2012. The rail laying of subway Line 1 is expected to be completed on Wednesday, and the 25.36-kilometer-long subway will be put into service in September of next year. [Xinhua]

Platelayers work at a construction site of subway Line 1 in Xi'an City, capital of northwest China's Shaanxi Province, Aug. 28, 2012. The rail laying of subway Line 1 is expected to be completed on Wednesday, and the 25.36-kilometer-long subway will be put into service in September of next year. [Xinhua]

Platelayers work at a construction site of subway Line 1 in Xi'an City, capital of northwest China's Shaanxi Province, Aug. 28, 2012. The rail laying of subway Line 1 is expected to be completed on Wednesday, and the 25.36-kilometer-long subway will be put into service in September of next year. [Xinhua]