Rail mounted gantry cranes are composed of main beams, rigid and flexible gantry legs, running trolleys, lifting mechanisms, trolley running mechanisms, electrical systems, operating cabs, etc. According to the yard operation process, the cantilever in the direction of the single gantry leg or the double gantry leg becomes a single cantilever or double cantilever model, and the non-cantilever model becomes a cantilever-free model.

Container gantry cranes are mainly used for container loading, unloading, handling and stacking in container railway transfer yards and large container storage yards. They are commonly used in places such as ports, freight stations, logistics centers and large warehouses.