Container Shipping and the World's Busiest Ports

Modern container shipping traces its origin to a single voyage: on 26 April 1956, the converted tanker Ideal X, owned by trucking entrepreneur Malcolm McLean's Pan-Atlantic Steamship Company, sailed from Port Newark, New Jersey, to Houston, Texas, carrying 58 truck trailer bodies lifted directly onto its deck as standardized metal boxes rather than loaded and unloaded piece by piece. McLean's insight, developed through his trucking business and later renamed Sea-Land Service, was that the enormous cost of ocean shipping lay not in the voyage itself but in the slow, labor-intensive process of breakbulk cargo handling at port, where dockworkers manually loaded irregular crates, barrels, and sacks. Economic historian Marc Levinson, in The Box (2006), documents how this innovation, combined with international standardization of container dimensions by the International Organization for Standardization beginning in 1968 around the 20-foot and 40-foot units that gave rise to the "twenty-foot equivalent unit" (TEU) as the industry's basic measure of capacity, collapsed loading times from days to hours and cut per-ton handling costs by an order of magnitude, making long-distance, low-margin manufacturing trade economically viable for the first time.