H.K. Porter, Inc.

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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.^{[clarification needed]}

Porter was known for building locomotives for industrial railways, which were often small enough that they could be operated by one person. Porter built mostly steam locomotives, but also some gas- and diesel- engined locomotives, and some that ran on compressed air.