The gantry 50t70m crane is commonly known as a "gantry crane". It refers to the traditional crane used in front of the port terminal. On the door shaped base running along the ground track, a rotatable crane boom is installed, which has four collaborative mechanisms for lifting, rotating, variable amplitude, and operation. Railway trains or other vehicles can pass under the door base, and vehicle and vessel loading and unloading as well as direct transfer operations can be carried out. A shore crane with a large span, used for grouping and stacking containers. This type of crane operates across several sets of containers and lifts and lowers them as needed. The crane is either rail mounted or rubber tire mounted. Some ships, such as container ships equipped with their own loading and unloading machines, also have this type of crane installed. This type of crane is shaped like a bridge.