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It produced its first locomotive in April 1867. Starting in in the 1870s under its superintendant and general manager Daniel A. Wightman, it became known for its productive of large locomotives. Its engines were shipped around the world, including to India and Japan.
By 1901, the company had produced over 2,400 locomotives. That same year it merged with the American Locomotive Company (Alco). In March 1919, American Locomotive closed the Pittsburgh facility.
Types of locomotives produced: