Ferrous metal scrap is scrap of iron and steel. This generally includes the scrap metal from automobiles, steel beams, equipment, appliances, ships, railway tracks, as well as food packaging and other containers. Scrap metal accounts for the largest volume in terms of the metal turned to scrap in the world. It can be classified into 80 general grades and over 40 grades of railroad scrap and additional grades of alloy scrap.