Employees use a crane to unload a Chinese wagon in Buenos Aires, capital of Argentina, on Feb. 28, 2013. A total of 42 new wagons will be used on the railways of Sarmiento and Mitre as part of a replacement plan of the Argentine government. (Xinhua/Martin Zabala)

Employees use a crane to unload a Chinese wagon in Buenos Aires, capital of Argentina, on Feb. 28, 2013. A total of 42 new wagons will be used on the railways of Sarmiento and Mitre as part of a replacement plan of the Argentine government. (Xinhua/Martin Zabala)

Employees work alongside a Chinese wagon in Buenos Aires, capital of Argentina, on Feb. 28, 2013. A total of 42 new wagons will be used on the railways of Sarmiento and Mitre as part of a replacement plan of the Argentine government. (Xinhua/Martin Zabala)

Employees work alongside a Chinese wagon in Buenos Aires, capital of Argentina, on Feb. 28, 2013. A total of 42 new wagons will be used on the railways of Sarmiento and Mitre as part of a replacement plan of the Argentine government. (Xinhua/Martin Zabala)

Argentinean Minister of the Interior and Transportation Florencio Randazzo (C) walks on a Chinese wagon in Buenos Aires, capital of Argentina, on Feb. 28, 2013. A total of 42 new wagons will be used on the railways of Sarmiento and Mitre as part of a replacement plan of the Argentine government. (Xinhua/Martin Zabala)

 An employee walks through a Chinese wagon in Buenos Aires, capital of Argentina, on Feb. 28, 2013. A total of 42 new wagons will be used on the railways of Sarmiento and Mitre as part of a replacement plan of the Argentine government. (Xinhua/Martin Zabala)