Passengers wait inside Guomao station in Subway Line 1 in Beijing, capital of China, Dec. 22, 2011. Signal malfunction hindered the operation of Subway Line 1 from about 6:11 p.m. to 7:12 p.m. Measures have been taken to evacuate the stranded passengers and the operation of Subway Line 1 has been recovered by the press time. [Xinhua/Liu Bin]