Before revision: A launching gantry (described also by other terms including beam launcher, girder launcher, bridge building crane, and bridge-building machine, locally nicknamed the Iron Monster) is a special-purpose mobile gantry crane used in bridge construction.
After revision: upright=1.5|Launching gantry used for Honolulu Rail Transit guideway construction (2015)A launching gantry (described also by other terms including beam launcher, girder launcher, bridge building crane, and bridge-building machine, locally nicknamed the Iron Monster) is a special-purpose mobile gantry crane used in bridge construction.