Railroad cars are vehicles designed to be transported on a railroad track. They come in various types, including freight cars for carrying goods, passenger cars for transporting people, and tank cars for liquids. Each type is built to serve specific purposes, ensuring efficient movement of materials and passengers across long distances. These cars are typically connected to a locomotive, which provides the power needed to move them. Railroad cars are essential components of the rail transport system, contributing to the economy by facilitating trade and travel. Their design and functionality have evolved over time to meet changing transportation needs.