A flatcar is a type of railroad car that has a flat, open deck without any sides or roof. It is primarily used for transporting large and heavy items, such as machinery, vehicles, and construction materials. The design allows for easy loading and unloading, often using cranes or forklifts. Flatcars come in various sizes and can be equipped with special features like tie-downs to secure cargo during transit. They are an essential part of the freight transportation system, working alongside other rail cars like boxcars and tank cars to move goods efficiently across long distances.