What does a tractor do? It feels like a front. There's nothing behind it
In front of the driving ability of the front is called a tractor, there is no traction behind the ability to drive vehicles called trailers, trailers are towed by tractor. There are two kinds of connection mode of the tractor and the trailer: the first one is the front half of a trailer traction saddle in the tractor rear section on the top of the back of the car bridge under traction Trailer part weight, which is half hanging; second is the front end of the tractor trailer even the rear of the towing vehicle only provide forward force, dragging the trailer go, but does not bear the weight down trailer, this is the whole hanging.
The car has a big hook, hanging behind the original car, the old tractor met, behind with the kind of long car loaded bricks what it's like most tractor time.
They are tow trailers, which are commonly used for container transportation or coal transportation and other minerals
The tractor is simply between the front and the carriage is a tool used for traction (which is the front of the vehicle can be separated from the original carriage and other traction carriage, and the carriage can also be detached from the original front by other locomotives traction) large trucks in general (trailer).
