Kirby Corp. engages in the provision of diesel engines, reduction gears and ancillary products for marine and power generation applications. It operates through the following segments: Marine Transportation and Distribution & Services segment. The Marine Transportation segment provides marine transportation services, operates tank barges and towing vessels transporting bulk liquid products and transports petrochemicals, refined petroleum products, black oil products and agricultural chemicals by tank barge. The Distribution & Services segment sells genuine replacement parts, provides service mechanics to overhaul and repair medium-speed and high-speed diesel engines, transmissions, reduction gears, pumps and compression products, maintains facilities to rebuild component parts or entire medium-speed and high-speed diesel engines, transmissions and reduction gears and manufactures and remanufactures oilfield service equipment, including pressure pumping units. The company was founded in 1921 and is headquartered in Houston, TX.