Containerization is the system of shipping goods in standardized intermodal containers that can move between ship, rail, and truck without unpacking. It is widely regarded as the single most important transport innovation of the 20th century, collapsing port labor costs, dramatically reducing pilferage, and making globalized supply chains economically possible.
The system began in 1956, when trucking entrepreneur Malcom McLean loaded 58 modified truck trailers onto the Ideal X and sailed them from Newark to Houston. Costs per ton of cargo fell from about $5.86 (break-bulk) to about $0.16 — a 97% reduction.
ISO standardized container dimensions in the 1960s and 1970s through standards ISO 668 (dimensions), ISO 6346 (markings), and ISO 1496 (specifications). The result was global interoperability: a container loaded in Ningbo can be lifted onto any vessel, any rail flatcar, and any chassis worldwide without modification.
Effects of containerization:
- Port labor demand collapsed; longshoring transformed from a manual trade to a capital-intensive crane operation
- Ocean freight rates fell roughly 90% in real terms between 1960 and 2000
- Manufacturing relocated to lower-wage countries that suddenly had cheap access to consumer markets
- Ports physically relocated from city centers (Manhattan, central London) to deep-water container terminals (Newark, Felixstowe)
Containerization is the precondition for modern customs systems — bulk goods are still handled, but the entire ACE and AMS architecture is built around containerized flows.