page_title: Container crane
section_title: Sizes
hierarchical_section_title: Container crane / Sizes
caption_attribution_description: Portainer (gantry crane) (Rotterdam harbour)
context_page_description: A container crane is a type of large dockside gantry crane found at container terminals for loading and unloading intermodal containers from container ships.
  Container cranes consist of a supporting framework that can traverse the length of a quay or yard on a rail track. Instead of a hook, they are equipped with a specialized handling tool called a spreader. The spreader can be lowered on top of a container and locks onto the container's four locking points using a twistlock mechanism. Cranes normally transport a single container at once, but some newer cranes have the capability to pick up two to four 20-foot containers at once.
context_section_description: Container cranes are generally classified by their lifting capacity and the size of the container ships they can load and unload.
caption: Super-post-Panamax cranes in the Port of Rotterdam. These overhang by 50 m (22 rows of containers).
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