Are trailers and tractors the same thing?
The 4 steering wheels are driven by a drawbar through a connecting rod. Trailers generally do not have braking devices, rail car parking only rely on traction brake device. Connections between tractors and trailers and trailers use connectors. The most common connectors are plug type hooks and automatic hooks.
Trailers should, as far as possible, follow the path of the tractor, which should be good trailing. Good flexibility is achieved by improving the flexibility of the trailer's steering. There are many forms of the trailer steering mechanism, the common ones are: all wheels are revolving casters (see trolley). The front axle consists of two wheels, and the rear axle is fixed (with the bogie steering Trailer).
Semi - trailer tractor, all - hang trailer.All of them are the moving vehicles for trackless train short distance transportation. Tractors and trailers belonging to moving vehicles do not include automobiles, tractors and trailers running on the road. Tractors are used for towing trailers, and sometimes for towing other equipment, such as towing aircraft or air cushion handling devices.