Heisler then disassociated himself from the design, going on to other projects at Alco, GE, the Army and Navy with some teaching and consulting at Penn State. At the time of his death in 1931, he had secured over 60 patents. Heisler's interest was inventing and not financial gain. It was donated by Vulcan Materials, the successor company to Campbell Limestone. It was built in 1923 by the Heisler Locomotives Works, who had taken over the Stearns' locomotive business.
Class represents weight in tons, averaging working order, number of drivers and size of drivers.
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