Kirby Corporation, through its subsidiaries, provides marine transportation and diesel engine services primarily in the United States. Its Marine Transportation segment provides transportation services for the inland and coastal markets. This segment transports petrochemicals, refined petroleum products, black oil products, and agricultural chemicals by tank barges; and the coastal transportation of dry-bulk cargoes. As of February 22, 2013, it owned or operated 841 inland tank barges, 253 inland towboats, 81 coastal tank barges, 86 coastal tugboats, 8 offshore dry-cargo barge and tugboat units, and 1 docking tugboat. The company's Diesel Engine Services segment is involved in the overhaul and repair of medium-speed and high-speed diesel engines and reduction gears; sale of related parts used in marine and power generation applications; distribution and service of high-speed diesel engines and transmissions, pumps, and compression products; and manufacture of oilfield service equipment, including pressure pumping units used in land-based pressure pumping, oilfield service, power generation, and transportation applications. This segment serves inland and offshore barge operators; oilfield service providers; oil and gas operators and producers; compression companies; offshore fishing companies; marine and on-highway transportation companies; the United States Coast Guard and the United States Navy; and power generation, nuclear, and industrial companies. The company was formerly known as Kirby Exploration Company, Inc. and changed its name to Kirby Corporation in 1990 because of the changing emphasis of its business. Kirby Corporation was founded in 1921 and is headquartered in Houston, Texas.