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Peterbilt 386 sleeper-cab–style commercial 6×4 tractor unit. A tractor unit, also known as a truck unit, lorry unit, power unit, prime mover, ten-wheeler, semi-tractor, semi-truck, semi-lorry, tractor cab, truck cab, lorry cab, big rig tractor, big rig truck or big rig lorry or simply a tractor, truck, lorry, semi, big rig or rig, is a characteristically heavy-duty towing engine that ...
Scania R 730 LA4x2MNB with the 2009 facelift Scania R 500 LA6x2HHA tractor unit with original styling First generation Scania P 270 fire engine, Dublin Fire Brigade, Ireland Scania develops, manufactures and sells trucks with a gross vehicle weight rating (GVWR) of more than 16 tonnes ( Class 8 ), intended for long-distance haulage, regional ...
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Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...
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In 1964, a change in the Construction and Use Regulations favoured articulated vehicles over the older rigid designs, and a new model was introduced to compete in the 32-ton market. More than 75% of heavy chassis sold in Britain in the following years were tractor units. In 1969, Foden made its first sales in Portugal.
The British Army replaced the Crusader in the late 1990s by a Seddon Atkinson tractor unit with a 40–tonne plant trailer and a specialist tank bridge transporter. Many have seen use in the heavy haulage industry due to their incredibly strong chassis. The special heavy haulage tractor was the Crusader based Samson 8×4 with tridem axles.
The AEC Mandator name was originally used for medium-duty models in the 1930s, but in 1949 the Matador 4x2 was renamed Mandator. The name was used for the heavier AEC 4x2s until the end of production in the 1970s, and was especially popular as a tractor unit. Mandator, model 669 (1931–35) – medium-duty 4x2 cabover