A railroad car is a vehicle designed for transporting goods or passengers on a railway track. These cars are connected to a locomotive, which provides the power to move them along the tracks. Railroad cars come in various types, including freight cars for cargo, passenger cars for travelers, and tank cars for liquids. Each railroad car is built with specific features to suit its purpose. For example, flatcars are used for heavy loads like machinery, while boxcars are enclosed to protect goods from the elements. The design and construction of railroad cars are essential for efficient and safe transportation.