Kirby Corporation is a tank barge operator, transporting bulk liquid products throughout the Mississippi River System, on the Gulf Intracoastal Waterway, coastwise along all three United States coasts and in Alaska and Hawaii. The Company transports petrochemicals, black oil, refined petroleum products and agricultural chemicals by tank barge. It also operates eight offshore barge and tug units. The Company operates in two business segments: marine transportation and diesel engine services. Its marine transportation segment is a provider of marine transportation services, operating tank barges and towing vessels. Its diesel engine services segment provides after-market services for medium-speed and high-speed diesel engines, reduction gears and ancillary products for marine and power generation applications, distributes and services high-speed diesel engines and transmissions, pumps and compression products, manufactures and remanufacturers oilfield service equipment.