Technicians work on a damaged train in a subway station after a power system breakdown and a subsequent collision of two trains in Shanghai December 22, 2009. A pivotal subway line in Shanghai was shut down early Tuesday for system failure and a subsequent collision of two trains, Xinhua News Agency reported. [Agencies]![Shanghai subway resumes operation after collision](http://www.chinadaily.com.cn/china/images/attachement/gif/site1/20091222/0013729e45180c9acbfc2c.gif)
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