Kirby Corp. is a tank barge operator, which engages in transporting bulk liquid products. The company is headquartered in Houston, Texas and currently employs 5,200 full-time employees. The firm operates through two segments: Marine Transportation, and Distribution and Services. The Marine Transportation segment provides marine transportation services, operating tank barges and towing vessels transporting bulk liquid products throughout the Mississippi River System, on the Gulf Intracoastal Waterway, coastwise along all three United States coasts. The Distribution and Services segment sells after-market service and replacement parts for engines, transmissions, reduction gears, electric motors, drives, and controls, specialized electrical distribution and control systems, energy storage battery systems, and related oilfield services equipment, rebuilds component parts or entire diesel engines, transmissions and reduction gears, and related equipment used in oilfield services, marine, power generation, and other industrial applications. The company also rents equipment such as generators, industrial compressors, and others.