The cable excavator is the ancestor of the hydraulic excavator. Invented in the mid-19th century, the cable shovel was mounted on rails and powered by steam. Later fitted with tracks or tires, its use declined in favor of the hydraulic excavator, which is easier to use and more manageable.
Cable shovels are still used for large construction sites, especially mining or dredging. They are sometimes called a dragline or dragline.
The cable excavator consists of a rotating turret, an arm and a clamshell driven by cables. It is similar in its lifting system to the crawler crane, which is however more powerful and does not have the same equipment.
Weserhütte, Liebherr, Demag, HBM-Nobas: used draglines are on Europe-Construction-Equipment.com