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 un-/load intermodal shipping containers from the largest
containerships approximately 18 containers or greater in width.