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Miller Ingenuity manufactures a diverse array of non-metallic freight car parts in its state-of-the-art, Winona, Minn., manufacturing facility. Freight car parts include: center plate liners, brake beam guide wear liners, coupler carrier wear plates, airbrake vent valve protectors and center plate lube disks. The company says all of its freight car parts are AAR approved and manufactured in the U.S.A.