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Tractor unit
A tractor unit (prime mover or traction unit) is a characteristically heavy-duty towing engine that provides motive power for hauling a towed or trailered load. These fall into two categories: very heavy-duty typically off-road capable, often 6×6, military and commercial tractor units, including ballast tractors, and heavy and medium duty military and commercial rear-wheel drive "semi tractors" used for hauling semi-trailers.
Tractor units typically have large displacement diesel engines for power, durability, and economy, and several axles for maximum flexibility in gearing.
The tractor-trailer combination distributes a load across multiple axles while being more maneuverable than an equivalently sized rigid truck. The most common trailer attachment system is a fifth wheel coupling, allowing rapid shift between trailers performing different functions, such as a bulk tipper and box trailer. Trailers containing differing cargos can be rapidly swapped between tractors, eliminating downtime while a trailer is unloaded or loaded.
Drawbar couplings are also found, particularly in dedicated exceptionally heavy-duty ballast tractors.
==Configurations==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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