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Containerization is a system of intermodal cargo transport using standard ISO containers that can be loaded on container ships, railroad cars, and trucks. There are three common standard lengths, 20 ft (6.1
m), 40 ft (12.2 m) and 45 ft (13.7 m). Container capacity (of ships, ports, etc) is
measured in twenty-foot equivalent units (TEU, or sometimes teu). A
twenty-foot equivalent unit is a measure of containerized cargo equal to one standard 20 ft (length) × 8 ft (width) × 8.5 ft
(height) container (approximately 39 m3). Most containers today are of the 40-ft variety and thus are 2 TEU. 45 ft
containers are also designated 2 TEU. Two TEU are referred to as one FEU or "Forty-foot equivalent unit". These
two terms of measurement are used interchangeably. "High cube" containers have a height of 9.5 ft (2.9 m), while half-height
containers, used for heavy loads, have a height of 4.25 ft (1.3 m).
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