An articulated vehicle is a vehicle which has a permanent or semi-permanent pivot joint in its construction, allowing it to turn more sharply. There are many kinds, from heavy equipment to buses,

tram A tram (called a streetcar or trolley in North America) is a rail vehicle that travels on tramway tracks on public urban streets; some include segments on segregated right-of-way. The tramlines or networks operated as public transport are ...

s and

trains In rail transport, a train (from Old French , from Latin , "to pull, to draw") is a series of connected vehicles that run along a railway track and transport people or freight. Trains are typically pulled or pushed by locomotives (often know ...

Steam locomotives A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomot ...

were sometimes articulated so driving wheels could pivot around corners. In a broader sense, any vehicle towing a trailer (including a

semi-trailer A semi-trailer is a trailer without a front axle. In the United States, the term is also used to refer to the combination of a truck and a semi-trailer; a tractor-trailer. A large proportion of a semi-trailer's weight is supported by a trac ...

) could be described as articulated (which comes from the

Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...

''articulus'', "small joint"). In the UK, an ''articulated lorry'' is the combination of a

tractor A tractor is an engineering vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a trailer or machinery such as that used in agriculture, mining or construction. Most commo ...

and a trailer, abbreviated to "artic". In the US, it is called a

semi-trailer truck A semi-trailer truck, also known as a semitruck, (or semi, eighteen-wheeler, big rig, tractor-trailer or, by synecdoche, a semitrailer) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-traile ...

, tractor-trailer or semi-truck, and is not necessarily considered articulated.

Types

Buses

Buses are articulated to allow for a much longer bus which can still navigate within the

turning radius The turning diameter of a vehicle is the minimum diameter (or "width") of available space required for that vehicle to make a circular turn (i.e. U-turn). The term thus refers to a theoretical minimal circle in which for example an aeroplane, a g ...

of a normal bus.

Trucks

In the UK,

tractor unit A tractor unit (also known as a truck unit, power unit, prime mover, ten-wheeler, semi-tractor, tractor truck, semi-truck, tractor cab, truck cab, tractor rig, truck rig or big rig or simply a tractor, truck, semi or rig) is a characteristical ...

and trailer combinations are referred to as Articulated lorries, or "artics".
semi-trailer
truck, also known as a semitruck, (or semi, eighteen-wheeler, big rig, tractor-trailer or, by synecdoche, a semitrailer) a] is the combination of a tractor unit and one or more semi-trailers to carry freight.

Trains and rail

Many train cars are made with articulated connections, sharing a common Bogie, truck between two cars. This reduces costs, weight, vibration and noise; and also enables higher speed running. One of the first examples of articulated railway carriages were used by the London & North Eastern Railway (LNER) in

Great Britain Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of , it is the largest of the British Isles, the largest European island and the ninth-largest island in the world. It i ...

on its London Suburban Trains in the mid-1920s ; this rolling stock was designed by Nigel Gresley and built at the LNER's

Doncaster Works Doncaster Railway Works is a railway workshop located in Doncaster, England. Also referred to as The Plant''", it was established by the Great Northern Railway in 1853, replacing the previous works in Boston and Peterborough. Until 1867 it u ...

. The four set "Quad-arts" were one of the very earliest articulated trains, this innovation was to save space. Although not the same as modern high speed trains where all the carriages share common bogies, they are an early form of the now more common design.

Tram A tram (called a streetcar or trolley in North America) is a rail vehicle that travels on tramway tracks on public urban streets; some include segments on segregated right-of-way. The tramlines or networks operated as public transport are ...

s and light rail vehicles have been made with articulated designs since the 1950s. Articulated trams, were invented and first used by the

Boston Elevated Railway The Boston Elevated Railway (BERy) was a streetcar and rapid transit railroad operated on, above, and below, the streets of Boston, Massachusetts and surrounding communities. Founded in 1894, it eventually acquired the West End Street Rai ...

in 1912–13. This was instead of using trailers or multiple units, which had been attempted in the early 1900s. The articulated design allows passengers (and fare inspectors) to move the entire length of the vehicle, whether stopped or in motion. File:DTTX 724681 20050529 IL Rochelle.jpg, Articulated well cars with containers File:Gresley Quad Art Set at Sheringham station - geograph.org.uk - 1386710.jpg, London & North Eastern Railway articulated train from 1924

Heavy equipment

Front loaders,

grader A grader, also commonly referred to as a road grader, motor grader, or simply a blade, is a form of heavy equipment with a long blade used to create a flat surface during grading. Although the earliest models were towed behind horses, and lat ...

dump truck A dump truck, known also as a dumping truck, dump trailer, dumper trailer, dump lorry or dumper lorry or a dumper for short, is used for transporting materials (such as dirt, gravel, or demolition waste) for construction as well as coal. A t ...

s and other vehicles have been made with articulated joints to greatly reduce their

and make a single track when making a turn in a soft surface like mud or sand. (the rear wheels follow the front wheel trajectory) The most common models of

articulated hauler An articulated hauler, articulated dump truck (ADT), or sometimes a dump hauler, is a very large heavy-duty type of dump truck used to transport loads over rough terrain, and occasionally on public roads. The vehicle usually has all-wheel drive and ...

s are Caterpillar,

Volvo The Volvo Group ( sv, Volvokoncernen; legally Aktiebolaget Volvo, shortened to AB Volvo, stylized as VOLVO) is a Swedish multinational manufacturing corporation headquartered in Gothenburg. While its core activity is the production, distributio ...

, and

Terex Terex Corporation is an American worldwide manufacturer of lifting and material-handling plant for a variety of industries including construction, infrastructure, quarrying, recycling, energy, mining, shipping, transportation, refining and ut ...

trucks ranging in tonnage from 25 to 40 ton.

Military vehicles

Some military vehicles, including the

United States Armed Forces The United States Armed Forces are the military forces of the United States. The armed forces consists of six service branches: the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. The president of the United States is ...

' M561 Gama Goat and the Swedish

Bandvagn 206 Bandvagn 206 (Bv 206) (meaning ''"Tracked Vehicle 206"'' in English) is a tracked articulated, all-terrain carrier developed by Hägglunds (now part of BAE Systems Platforms & Services) for the Swedish Army. It consists of two units, with all f ...

were engineered with an articulated body for rough terrain capability.

Watercraft

The "integral unit", or "Integrated Tug and Barge" (ITB), comprises specially designed vessels that lock together in such a rigid and strong method as to be certified as such by authorities (classification societies) such as the

American Bureau of Shipping American(s) may refer to: * American, something of, from, or related to the United States of America, commonly known as the "United States" or "America" ** Americans, citizens and nationals of the United States of America ** American ancestry, pe ...

Lloyd's Register of Shipping Lloyd's Register Group Limited (LR) is a technical and professional services organisation and a maritime classification society, wholly owned by the Lloyd’s Register Foundation, a UK charity dedicated to research and education in science and ...

Indian Register of Shipping Indian Register of Shipping (IRClass) is an internationally recognised, independent ship classification society, founded in India in 1975. It is a public limited company incorporated under Section 25 of the Indian Companies Act 1956 (Section 8 ...

Det Norske Veritas DNV (formerly DNV GL) is an international accredited registrar and classification society headquartered in Høvik, Norway. The company currently has about 12,000 employees and 350 offices operating in more than 100 countries, and provides ser ...

or several others. These units stay combined under virtually any sea conditions and the "tugs" usually have poor sea-keeping designs for navigation without their "barges" attached. Vessels in this category are legally considered to be ships rather than tugboats and barges must be staffed accordingly. These vessels must show navigation lights compliant with those required of ships rather than those required of tugboats and vessels under tow. "Articulated Tug and Barge" (ATB) units also utilize mechanical means to connect to their barges. ATBs generally utilize Intercon and

Bludworth {{unreferenced, date=March 2011 The Bludworth articulated tug and barge (ATB) ocean tug barge connection system was developed by Richard and Robert Bludworth during the 1960s. The first Bludworth articulated tug barge unit was the ocean Liquefi ...

connecting systems. ATBs are generally staffed as a large tugboat, with between seven and nine crew members. The typical American ATB operating on the east coast, per custom, displays navigational lights of a towing vessel pushing ahead, as described in the '72 COLREGS.

References

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