Kirby Corporation is an inland tank barge operator that specializes in the transportation of bulk liquid products. It offers transporting of petrochemicals, pressurized products, black oil products, refined petroleum products, and agricultural chemical products. Kirby Corporation is also a diesel engine service provider, offering customers a source for the service and distribution of diesel engines and ancillary products, and the manufacture and remanufacture of oilfield service equipment, including pressure pumping units. In marine and power generation applications, the company provides after-market service for medium-speed and high-speed diesel engines, reduction gears, and ancillary products. In the oilfield services and land-based pressure pumping markets, Kirby serves as a distributor and service provider for high-speed diesel engines, transmissions, and pumps.