Technicians repair a damaged subway train 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 collision](http://www.chinadaily.com.cn/photo/images/attachement/gif/site1/20091222/0013729e48090c9ac1302b.gif)
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