Treasury Secretary Jacob Lew, center left, tours the Siemens manufacturing plant with manager Shujath Ali, right, to view the assembly of electrical drive components for heavy machinery in Alpharetta, Ga., Thursday, March 14, 2013. The drive technology facility makes large traction drive trains for customers including AMTRAK, Caterpillar and the new Atlanta Streetcar initiative. (AP Photo/David Tulis)

Associated Press
Treasury Secretary Jacob Lew, center left, tours the Siemens manufacturing plant with manager Shujath Ali, right, to view the assembly of electrical drive components for heavy machinery in Alpharetta, Ga., Thursday, March 14, 2013. The drive technology facility makes large traction drive trains for customers including AMTRAK, Caterpillar and the new Atlanta Streetcar initiative. (AP Photo/David Tulis)
Treasury Secretary Jacob Lew, center left, tours the Siemens manufacturing plant with manager Shujath Ali, right, to view the assembly of electrical drive components for heavy machinery in Alpharetta, Ga., Thursday, March 14, 2013. The drive technology facility makes large traction drive trains for customers including AMTRAK, Caterpillar and the new Atlanta Streetcar initiative. (AP Photo/David Tulis)
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