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Griffin wheels are cast in graphite molds by a controlled pressure-pouring process that produces wheels to precise tolerances, thus eliminating the need for tread machining and reducing the number of different tape sizes, the company says. Heat treating is tightly controlled to ensure that quenching hardens the tread through the wear limit, the company says, adding that it developed the first curved plate wheel design and was the first to standardize the parabolic, deep-dish, low-stress wheel in 1964. Freight car wheels are offered in 28-, 33-, 36- and 38-inch diameters. Locomotive wheels are also offered in the following sizes: 41-inch diameter with a 3-inch rim thickness; and 42-inch diameter with a 2.5-inch rim thickness. There are Griffin plants in Columbus, Ohio; Kansas City, Kan.; and Keokuk, Iowa. Griffin's Canadian plant is located in Winnipeg, Manitoba.