| Here is the illustration on page 61 of the "Pennsylvania Railroad Altoona Machine Shops Construction Number List: 1866-1904." It was compiled by Joseph D. Lovell, and published by the Library Of American Transportation during 1984. Photo Caption: "PRR No. 940 of Class Q, a four-wheel saddletank switcher design, was built in July 1892 and scrapped in July 1915. This class later became Class A-2a." |