Train cars are vehicles that run on railway tracks and are used to transport goods or passengers. They are connected to a locomotive, which provides the power to move the entire train. Train cars come in various types, including freight cars for carrying cargo and passenger cars for transporting people. Each train car is designed for specific purposes. For example, boxcars are used for shipping large items, while tank cars are built to carry liquids. The design and construction of train cars ensure they can safely and efficiently handle the loads they carry over long distances.