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