H.K. Porter, Inc. (Porter) manufactured light-duty railroad locomotives in the US, starting in 1866. The company became the largest producer of industrial locomotives, and built almost eight thousand of them. The last locomotive was built in 1950, but the company continues to produce industrial equipment to this day. Porter was known for building locomotives that were much smaller than those normally used by the larger Class I railroads. The company's locomotives were small enough that they were often operated by only one person. Porter built mostly steam locomotives, but they also built some powered by gasoline and diesel engines, and some that ran on compressed air. The largest collection of Porter photographs and information is currently housed in the Kentlein Porter Collection at the A. C. Kalmbach Memorial Library (a service of the National Model Railroad Association) in Chattanooga, TN. Many of the 780 builder's photos, blueprints and other locomotive data were republished in Porter Steam Locomotives, published by the library. Timeline 1866: Henry Kirke Porter formed a partnership with John Y. Smith and they called the company Smith & Porter. The two opened a small machine shop on 28th Street in Pittsburgh, Pennsylvania, and begin repairing and building industrial equipment. They received an order for their first locomotive on March 4, 1867, and built the Joshua Rhodes for the New Castle Railroad and Mining Company. They went on to build 43 locomotives together, including the Minnetonka (preserved at the Lake Superior Museum of Transportation). They specialized in four wheeled, saddle tank locomotives for small industrial railroads. 1871: Fire broke out in the shop on February 7, destroying twelve locomotives under construction, the shop, and 23 adjacent structures. Total losses were estimated at $200,000, and the partnership was dissolved. Smith formed Smith & Dawson Locomotives, which became National Locomotive Works. Porter formed a partnership with Arthur W. Bell, called Porter, Bell & Co., and they built their first locomotive for the Jackson Furnace Co. of Michigan. They expanded their range to include light passenger engines and small freight engines, primarily for narrow gauge railroads. They built 223 locomotives, until Arthur Bell died in May 1878. 1878: Henry K. Porter continued the business on his own, as H.K. Porter & Co. He had established a reputation as a builder of rugged, specialized locomotives. He could custom build a locomotive quickly and efficiently, with a system of interchangeable parts; pistons, wheels and