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Sapa Extrusions has years of global experience in developing aluminum technology for freight and passenger rail cars. Sapa partners with customers to provide design and engineering solutions. More than just supplying parts, the company specializes in product development to lower operating costs and increase revenue. Sapa aluminum profiles offer weight savings, increased cargo capacity and reduced maintenance, the company says. With 16 North American plants, Sapa solutions include large, complex shapes for multi-hollow panels, fabrication (including friction stir welding) and body assembly.