International Shipholding provides maritime transportation services through its subsidiaries, Central Gulf Lines, CG Railway, LCI Shipholdings, LMS Shipmanagement, and Waterman Steamship Corporation. The company operates a fleet of U.S.- and foreign-registered vessels that serve commercial customers and government agencies. Vessels transport automobiles, coal, molten sulphur, and liquified petroleum-gas. Customers often retain vessels through time-charter contracts. The company has offices in New York, New Orleans, and Washington D.C.