Freight trains are long trains designed to transport goods and materials across distances. Unlike passenger trains, which carry people, freight trains carry a variety of items, such as coal, automobiles, and containers filled with products. They are an essential part of the transportation system, helping to move large quantities of goods efficiently and cost-effectively. These trains consist of several freight cars linked together, each serving a specific purpose. For example, some cars are designed for carrying liquids, while others are built for heavy loads like lumber or grain. Freight trains can travel across vast landscapes, connecting cities and industries, making them vital for the economy.