The pre-skidding of full trees can be performed either by animals (horse) or as mechanized work by machines.
As machines usually a tractor winch or a cable yarder are taken for the subprocess of pre-skidding.
While the tractor winch and horse can only drag the full tree from the stand (buffer 11) to the trail (buffer 21), the cable yarder is able to carry the full tree to the trail.
» Technodiversity Glossary
