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Intermodal containers shipped by rail within North America are primarily 53 feet (16.15 m) long, with trailer-on-flat-car (TOFC) units used as well. The 53-foot length reflects a common maximum length for highway semi-trailers, which varies by state. [12] Major domestic intermodal carriers include: J. B. Hunt; Swift; Schneider National; Hub Group
The ISO 668 standard has so far never standardized 10 ft (3 m) containers to be the same height as so-called "Standard-height", 8 ft 6 in (2.59 m), 20- and 40-foot containers. By the ISO standard, 10-foot (and previously included 5-ft and 6 1 ⁄ 2-ft boxes) are only of unnamed, 8-foot (2.44 m
53 ft, 48 ft, 45 ft, 40 ft and 20 ft containers stacked. Double-stack wellcars come in a number of sizes, related to the standard sizes of the containers they are designed to carry. Well lengths of 40 ft (12.19 m), 48 ft (14.63 m) and 53 ft (16.15 m) are most common. A number of 45 ft (13.72 m) wells and 56 ft (17.07 m) wells also exist.
Not shown is the rare, but also possible combination of a 30-foot container coupled to a 10-foot box, in a 40(+) foot long stack. The ISO 668 standard firstly classifies containers by their length in whole feet for their 'common names', despite all measurement units used being either metric (SI) or officially based on the metric system .
In Canada, a Turnpike Double is two 53 ft (16.2 m) trailers, and a Rocky Mountain Double is a 50 ft (15.2 m) trailer with a 24 ft (7.3 m) "pup". [ 30 ] [ 31 ] [ 32 ] The US federal government, which only regulates the Interstate Highway System , does not set maximum length requirements (except on auto and boat transporters), only minimums.
A longer TOFC (trailer on flat car) is usually an 89 ft (27.13 m) car. In the past, these carried three 30 ft (9.14 m) trailers which are, as of 2007, almost obsolete, or one large, 53 ft (16.15 m), two 40-foot (12.19 m) or 45-foot (13.72 m) trailers. As intermodal traffic grows, these dedicated flats are in decline.
US domestic standard containers are generally 48 ft (14.63 m) and 53 ft (16.15 m) (rail and truck). Container capacity is often expressed in twenty-foot equivalent units (TEU, or sometimes teu ). An equivalent unit is a measure of containerized cargo capacity equal to one standard 20 ft (6.10 m) (length) × 8 ft (2.44 m) (width) container.
Colorado allows what are known as "Rocky Mountain Doubles" which is one full length 53 ft or 16 m trailer and an additional 28 ft or 8.5 m trailer. The term "road train" is not commonly used in the United States; "turnpike train" has been used, generally in a pejorative sense. [26] STAA double pup 28.5 foot trailers
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