A gantry crane is a type of overhead crane that is similar to a bridge crane, but instead of moving on suspended runways, the crane uses legs to support the bridge, trolley, and hoist. These legs travel on res or on rails that are embedded in the floor or ground structure.
There are different gantry crane variants, including:

• Full Gantries 
• Semi-Gantries
• Portable Gantries
• Adjustable Gantries