pivit låg.stl I the open end of "US Intermodular Container Car ½" there are 4 x 2mm channels to insert a 2mm wire to steer the two part together when you glue them together. In the other end there are holes for 4 x M2 x 14mm countersunk screws to join in to "Ende3" and in "Ende3" there are room for M3 nuts. On the underside of "Ende3" you can fit a M6 nut and close the hole with a "pivit låg". Either Glue them together or use a 2 x M2x6mm countersunk screw.