hole in a fixed lug or by a tab causing rotation of a rotatable lug application_number US 16544093 A description two intermodal cargo containers 20 and 22 are shown in fig1 stacked together employing the integrated interbox connectors 24 and 25 of the present invention each of the intermodal cargo containers 20 and 22 comprises a space enclosing structure which includes a floor 26 a roof 28 and parallel side walls 30 the containers 20 and 22 include a front end 32 and a rear end 34 the rear end 34 includes an opening to permit entry and exit of cargo the opening being secured by doors not shown stacking interlocking apertures 36 are provided in the floor 26 of the containers 20 and 22 to permit stacking of the containers with conventional 40 foot length containers or similar structures spaced at the conventional 40 foot distance chassis interlocking castings 38 having apertures are provided in the outermost corners of the floor 26 to permit locking of the container to a wheeled chassis for transportation in a truck mode side top lifting apertures 40 are provided to receive pin or wedge type lift elements for lifting the intermodal cargo containers to permit assembly and disassembly of the various transportation mode schemes the integrated interbox connectors 24 and 25 of the present invention are shown in fig1 to cooperate with downwardly facing openings included in the chassis interlocking castings at the lower corners of the container 22 fig2 6 detail a first preferred structure for an integrated interbox connector 25 of the present invention used on the rear end 34 of the container a rear corner post 42 extends from the floor 26 to the roof 28 of the container and is joined.