Containerization and Its Effect on World Trade
Containerization is the transport system in which cargo moves between ships, trains and trucks in standard-sized containers.
Containerization is the transport system in which cargo moves between ships, trains and trucks in standard-sized containers. Goods go into a steel box, and the box travels from sender to receiver without being opened. The system began on 26 April 1956, on a ship that sailed from Newark to Houston with 58 boxes. By 2010 about 60% of world seaborne trade moved in containers, and the largest ships now exceed 24,000 TEU.[2][3]
The Problem of Loading by Hand
A typical ocean-going ship in the 1950s carried around 200,000 separate crates, bags, barrels and bales, arriving at the dock in hundreds of separate shipments. Each piece came off a truck or rail car into a warehouse. At loading time it came out again, went onto a pallet, was lifted by winch into the hold and was stowed there by hand. At the other end the whole process ran in reverse. Moving goods across an ocean therefore often cost 15% or even 20% of their value, and many goods were not worth trading at all.[1] The ship meanwhile sat at the quay for days, and a ship only earns money at sea.[5]
Earlier Attempts at a Box
The idea of putting cargo in a box was old. In 1766 James Brindley designed a boat for the Bridgewater Canal in England that carried coal in ten wooden boxes. In the 1830s the Liverpool and Manchester Railway used coal boxes that could transfer between vehicles. From the 1920s European and American railways opened container services, and the Paris-based International Container Bureau set the first shared dimensions in 1933. The US Army developed the CONEX box in 1952 and had more than 200,000 by 1967. In 1949 the engineer Keith Tantlinger designed 200 stackable boxes for Ocean Van Lines.[2]
These efforts stayed local, because nobody had tied the box to the whole transport chain. Cranes, ships, truck frames and ports were not built around the same container. The person who did that did not come from shipping.
A Trucker's Arithmetic
Malcom McLean was born in 1913 in the cotton town of Maxton, North Carolina. As a child he sold eggs at the roadside. When he finished high school in 1931, in the middle of the Depression, there was no money for college, so he stocked shelves in a grocery and then ran a filling station. He bought a used truck and started McLean Trucking, in 1934 according to Levinson and 1935 according to other sources, at first as its only driver.[1][5] The firm soon became a large carrier of textiles and cigarettes. Because the Interstate Commerce Commission tied rates to costs, his way to compete was to cut costs, which is why he spent time on things like reshaping trailer sides to lower wind resistance.[1]
A story told later has the idea coming to him in 1937, while he waited most of a day to deliver cotton bales to a pier in New Jersey.[6] Levinson's account is later. By the early 1950s car sales had boomed and the East Coast's main roads were jammed, with the interstate highways still years away. Traffic was delaying McLean's drivers and raising his costs. His answer was coastal terminals where trucks would drive up ramps and leave their trailers on a ship running between North Carolina, New York and Rhode Island.[1]
The arithmetic had a flaw: wheels and chassis wasted valuable space on board. McLean decided to remove the wheels and load only the trailer body. Bodies could be stacked, and since the ship was the costliest part of the operation, each extra box cut the cost per box.[1] For the engineering he worked with Tantlinger, who argued that boxes should separate from the chassis and stack. The corner casting and twistlock are his designs.[2][7]
There was a legal barrier too, since federal rules barred trucking companies from owning ships. In 1955 McLean sold his highly profitable truck line, bought a marginally profitable ship line, Pan-Atlantic Steamship, and raised a $22 million bank loan. Asked later whether he had thought of protecting his wealth from the risk, he said you had to be "totally committed."[1][5]
The First Voyage, Newark to Houston
On 26 April 1956 the converted T2 tanker Ideal-X took 58 aluminium 35-foot bodies onto a frame above her deck at Newark. Her main cargo was still the 15,000 tons of petroleum below deck. A hundred guests came to watch. Loading took under eight hours, she reached Houston five days later, and waiting trucks took the boxes to factories and warehouses. McLean's experts calculated that loading loose cargo on a medium-sized ship cost about $5.83 a ton, against about 16 cents for the Ideal-X.[1][4][6]
The next year Gateway City began service as a ship carrying only boxes. The Puerto Rico route opened in 1958, the company became Sea-Land in 1960 and turned a profit in 1961.[5] Rivals started buying boxes of their own, each with its own size and corner fitting, so goods packed into one line's box could travel only on that line's ships to the ports it served.[1] Hand loading survives today as a separate trade called breakbulk, but most factory goods moved into the box over time.
How the Port Cities Changed
The sharpest effect was on the waterfront. In the first half of the century the shores of Manhattan, Brooklyn, Hoboken and Jersey City were lined with piers for miles. Those piers were too narrow for boxes and their yards too small.[8] The Port Authority built its new terminal across from Manhattan, at Elizabeth on Newark Bay. Opened in 1962, it is regarded as the first terminal built for containers. Sea-Land opened a 101-acre facility there in August 1963.[5][8]
The dockworkers' unions knew what was coming. Working a traditional ship took armies of men, and the box would remove thousands of jobs. After repeated strikes on both the Atlantic and Pacific coasts, employers and unions agreed in the early 1960s on payments to displaced workers.[1] Old port cities such as New York and San Francisco took years to replace what they lost.[1] The Port of New York and New Jersey handled 4.9 million containers (8.9 million TEU) in 2025.[8]
The ISO Standard and McLean's Patents
Incompatible boxes worried the US Navy most, since it feared having to supply troops overseas with mismatched ships. At its urging, American transport companies began discussing a standard in 1958, and ISO took up the cause. The talks went nowhere for years. In the end the negotiators turned to McLean. Sea-Land released its patent rights on 29 January 1963, and Tantlinger's corner fitting and lock became the basis of the common standard. Votes in September 1965 adopted a modified Sea-Land design, first as the American and then the international standard. ISO 668 appeared in January 1968 and the corner fitting recommendation in January 1970.[1][2]
A box filled in one country could now board any ship and come off under any crane in another. The 1972 Convention for Safe Containers (CSC) required a safety approval plate on international boxes.[2] The industry's unit comes from these standards too. TEU means twenty-foot equivalent unit, and a 40-foot box counts as 2 TEU.
Vietnam and the Japan Route
What made ocean container shipping convincing was a war. Sea-Land had started service to Rotterdam, Bremen and Grangemouth in April 1966. In 1967 it won a Defense Department contract to supply US troops in Vietnam, work that produced 40% of revenue in 1968/69. The contract paid for the round trip, and the ships came back empty. McLean filled that space in Japan. From 1968, televisions and stereos from companies like Matsushita and Pioneer went to the United States in large volumes.[1][5]
In 1969 the tobacco group R.J. Reynolds bought the company for $530 million, of which McLean received $160 million.[5]
How Production Moved
The larger result came away from the ports. In 1956 most industry served local markets, because shipping goods across an ocean ruined the numbers on most items. As freight got cheaper, the place of manufacture and the place of sale separated. Consumers gained a far wider choice, and factory workers found themselves competing with plants on the other side of the world. According to Levinson none of this was in McLean's calculation, since he only wanted to lower his trucking company's costs.[1] In 2016 the equivalent of nearly 10 million truck-size containers reached US ports. How much depended on this became clear when container shortages fed a global supply crisis in 2020 and 2021.[1][2] The place of the container in shipping as a whole is covered in maritime transport.
Speed, Fuel and Ship Size
A container ship's economics rest on cost per box, and fuel weighs heavily in that. Sea-Land's SL-7 class, delivered in 1972 and 1973, could exceed 33 knots on 120,000 horsepower steam turbines. After the 1973 oil shock that power became too expensive, and the US Navy bought the eight ships in 1981 and 1982.[9]
McLean came back to the sea. In 1978 he bought United States Lines and made the opposite bet, giving up speed for larger, fuel-efficient 4,400 TEU ships. When oil prices fell the slow ships lost their advantage, and the company went bankrupt in 1986 with thousands of jobs lost.[1][5] Five years later, at 77, McLean started yet another shipping company. He died in New York on 25 May 2001.[1][5]
Ships kept growing. In 2026 the largest is usually given as MSC Irina at about 24,346 TEU, though capacity figures vary by a few hundred TEU between sources. The record load on one voyage is 22,233 TEU on One Innovation in September 2025.[3] Because the largest ships cannot call everywhere, a network of hub ports and feeder routes developed, with small ships bringing boxes to the hub and large ships crossing the ocean. Some recent large orders come with LNG or methanol dual-fuel systems.[3]
Frequently asked questions
What is containerization?
Containerization is the transport system in which cargo moves between ships, trains and trucks in standard-sized containers.
Who invented the shipping container?
The idea of carrying cargo in boxes goes back to the 18th century. The system in use today was built by the American trucker Malcom McLean, and the box's corner fitting and lock were designed by the engineer Keith Tantlinger.
When was the first container voyage?
The voyage regarded as the start of the commercial system is the Ideal-X's trip from Newark to Houston with 58 boxes on 26 April 1956.
What does TEU mean?
TEU is a twenty-foot equivalent unit. A 20-foot box counts as 1 TEU and a 40-foot box as 2 TEU.
Sources
- Marc Levinson. The Now-Ubiquitous Shipping Container Was an Idea Before Its Time, Smithsonian.com, 16 June 2017.
- Wikipedia. Intermodal Container; Containerization.
- GetTransport. Biggest Container Ships and Shipping Lines 2026; Wikipedia, List of Largest Container Ships.
- Jean-Paul Rodrigue. First Containership, Ideal-X, 1956, The Geography of Transport Systems.
- Wikipedia. Malcom McLean.
- The Maritime Executive. The Story of Malcom McLean.
- Wikipedia. Keith Tantlinger.
- Maritime Professional. Shipping Containerization Marks 70 Years, 28 April 2026.
- Wikipedia. SL-7 Class Fast Sealift Ship.
