1. APPARATUS FOR TRANSPORTING FREIGHT COMPRISING A RAILROAD FLAT CAR HAVING A FLAT BED AND A SHED STRUCTURE AT ITS LONGITUDINALLY CENTER PORTION IN COMBINATION WITH A PAIR OF HIGHWAY TRUCK CONTAINER BODIES EACH MOUNTED ON AN END PORTION OF THE BED, SAID SHED STRUCTURE COMPRISING FOUR POSTS JOINED TOGETHER AT THEIR UPPER ENDS BY A ROOF STRUCTURE AND DEFINING DOORWAYS AT THE SIDES OF THE SHED STRUCTURE AND ACCESS OPENINGS AT THE ENDS OF THE SHED STRUCTURE EACH HAVING A WIDTH SUBSTANTIALLY EQUAL TO THE WIDTH OF ONE OF SAID CONTAINER BODIES, EACH OF SAID BODIES HAVING ITS REAR END JUXTAPOSED IN SEALED RELATION TO THE ACCESS OPENING IN THE ADJACENT END OF THE SHED STRUCTURE AND EACH OF SAID BODY ENDS HAVING A PAIR OF DOORS HINGED TO THE SIDES OF THE BODY AND SWINGABLE THROUGH THE ADJACENT ACCESS OPENING IN THE SHED STRUCTURE FROM A RETRACTED COPLANAR CLOSING POSITION THROUGH APPROXIMATELY 180 DEGREES TO A PROJECTED POSITION UNCOVERING THE FULL WIDTH OF THE BODY AND EXTENDING SUBSTANTIALLY RIGHT ANGULARLY FROM THE FLAT CAR THROUGH THE ADJACENT DOORWAY IN THE SIDE OF THE SHED STRUCTURE, AND A ROLLING OVERHEAD DOOR MOUNTED ON THE SHED STRUCTURE ABOVE EACH OF SAID DOORWAYS FOR CLOSING THE SAME WHEN THE ADJACENT BODY DOOR IS IN RETRACTED POSITION.