Zip line trolley

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A zip-line trolley is a metal device that connects a person or a load to a cable and allows them to move along the cable either under their own power or by using gravity. A trolley is usually comprised of a metal frame with one or more shivs (wheels) that the trolley runs on. The load or user is connected to the trolley via a carabiner or another form of engineered link and a harness. Occasionally trolleys have a handhold or handlebar although this system does not provide any fall protection and should only be used on zip lines that are low to the ground and over water.

Some zip lines are used for true transportation value while others are purely for recreation and amusement.