Gantry cranes are a high-legged, high-rise portal crane that lifts objects with a hoist mounted on a hoist trolley and can move horizontally on a rail or a pair of rails mounted under a beam or work floor. A Gantry Crane has a supporting beam end relying on a wheeled upright foot running on a rail above the foundation, usually on parallel side walls of the same factory or industrial building, so that the entire crane can be moved along the building while the hoist can be moved to and fro throughout Width of the building. A Gantry Crane can also be placed outside the building (outdoor).