gantry (en)

(noun) a frame for supporting barrels / (noun) ; a frame structure raised on side supports so as to span over or around something; as / (noun) a platform made to carry a traveling crane and supported by towers or side frames running on parallel tracks / (noun) a movable structure with platforms at different levels used for erecting and servicing rockets before launching / (noun) a structure spanning several railroad tracks and displaying signals for each