An arm-mounted crane supported by two legs on a ground track or foundation. Having a track running along the ground, under which a railway vehicle or other ground vehicle may be used.

An arm-mounted crane with a rotatable lifting device mounted on a door-shaped seat frame. The 4 legs of the Portal frame Form 4 "openings" that can be used by railway vehicles and other vehicles. Most gantry cranes run on the ground or in the crane rails on the building to carry out lifting and handling operations. The "zigzag" Crane is called a gantry crane, with one side of its running track located on the ground and the other on a building above ground.