Rail cars are vehicles designed to run on railways and transport goods or passengers. They come in various types, including freight cars for cargo and passenger cars for travelers. Each type is built to serve specific needs, such as carrying bulk materials, vehicles, or people. Typically made of metal, rail cars are connected to locomotives that provide the power to move them along the tracks. They are an essential part of the rail transport system, allowing for efficient movement of large quantities of items over long distances.