BEIJING — China plans to bid for contracts to build U.S. high-speed train lines and is stepping up exports of rail technology to Europe and Latin America, a government official said Saturday. China has built 4,000 miles (6,500 kilometers) of high-speed rail for its own train system and President Barack Obama issued a pledge in November with his Chinese counterpart, Hu Jintao, to cooperate in developing the technology. Read more: High-Speed Rail , Trains , Travel , US High-Speed Rail , China , Green News

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