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.

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