These wagons have a level floor and solid sides with at least one door on each side. They are mainly used for transporting bulk goods, coal, scrap, steel, wood and paper. The majority of wagons have folding sides and end walls, otherwise they are given the letters l (fixed sides) or o (fixed end walls). Wagons may have one or two folding end walls. Steel rings enable ropes, nets or covers to be attached to secure the load.