A crane
mounted on a “gantry;” a frame or structure spanning an intervening space,
often a workspace. The gantry may be mounted on wheels. The top 25 ports for each category (tonnage, container, and dry bulk) are based upon the 2020 port rankings published by the U.S. Army Corps of Engineer, Waterborne Commerce Statistics Center. Cranes include those at active marine terminal, based upon U.S. Department of Transportation, Bureau of Transportation Statistics analysis, using AIS data from the U.S. Coast Guard’s Nationwide Automatic Identification System (NAIS) archive, processed by the U.S. Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory's AIS Analysis Package (AISAP) software package.
 A class of crane that can fully load and unload
containers from the largest container vessels currently in operation that can
be up to 24-rows of containers in width.