Kirby Corporation operates domestic tank barges and transports bulk liquid products. The company's Marine Transportation segment provides marine transportation services and towing vessels transporting bulk liquid products, as well as operates tank barges throughout the Mississippi River System, on the Gulf Intracoastal Waterway, coastwise along three United States coasts, and in Alaska and Hawaii. This segment transports petrochemicals, black oil, refined petroleum products, and agricultural chemicals by tank barges. This segment also operates offshore dry-bulk barge and tugboat units that are engaged in the offshore transportation of dry-bulk cargoes in the United States coastal trade. As of February 23, 2015, this segment owned or operated 884 inland tank barges with 17.8 million barrels of capacity, 247 inland towboats, 69 coastal tank barges with 6 million barrels of capacity, 74 coastal tugboats, 6 offshore dry-bulk cargo barges, 7 offshore tugboats, and 1 docking tugboat. Its Diesel Engine Services segment sells replacement parts; provides service mechanics to overhaul and repair medium-speed and high-speed diesel engines, transmissions, reduction gears, pumps, and compression products; and maintains facilities to rebuild component parts or entire medium-speed and high-speed diesel engines, transmissions and entire reduction gears, and manufactures and remanufactures oilfield service equipment, including pressure pumping units. This segment serves inland and offshore barge operators, oilfield service companies, oil and gas operators and producers, compression companies, offshore fishing companies, and marine and on-highway transportation companies, as well as the United States Coast Guard; 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. Kirby Corporation was founded in 1921 and is headquartered in Houston, Texas.