There are many photographs related to the products made at Steelton, Pennsylvania, where the frog and switch division and a rail mill plant were located. There are also plant views. An inspection report of track material furnished by the Pennsylvania Steel Company for Lake Shore & Michigan Southern Railway is included in this part of the collection. Also of interest are views of the Pennsylvania Steel Co. exhibits at trade conventions in Chicago and Atlantic City, New Jersey Some other miscellaneous views are also found with the Steelton material: the Queensborough Bridge in Manhattan; Broad Street Station, Philadelphia; train station in Pittsburgh; Union Station, Washington.

Cambria Iron Works which was established in 1852 officially became the Cambria Steel Company in 1898. That company was acquired by Midvale Steel and Ordnance Company in 1916. Midvale was absorbed by Bethlehem Steel Corporation in 1923.

Approximately 968 glass plates and forty-six lantern slides. There are glass plate negatives with patterns for frogs, rails, and switches. There are no corresponding prints. Some plates contain unidentified images and images of unidentified products. Lantern slides of unidentified products.