English: A hopper car is a type of railroad freight wagon used to transport loose bulk commodities. There are Two main types of hopper car: covered hopper cars, which are equipped with a roof, and open-top hopper cars, which do not have a roof. Covered hopper cars are used for bulk cargo such as food, grain, fertilizen cement, and other building materials, that must be protected from exposure to the weather. Open hopper cars are used for commodities such as coal, ore, grain, and track ballast which can suffer exposure with less detrimental effect Hopper cars have opening doors on the underside to discharge its cargo. In the late 1960s, Renfe commissioned new units to increase its fleet of ore hoppers. In 1968,110 brand new units were built Later on, 220 units more were delivered with the same design but a larger loading capacity of up to 35 m3. As much as 180 units had a swinging roof to prevent loss of load and humidification because of the rain, like the one being displayed. They used to transport iron ore from Minas del Marquesado (Granada) but nowadays they have been discarded.