Train systems are networks of trains that transport passengers and goods across various distances. They consist of tracks, stations, and trains, which can be powered by electricity, diesel, or steam. Train systems are essential for urban commuting and long-distance travel, providing a reliable and efficient mode of transportation. In many countries, train systems are operated by government agencies or private companies. They can include different types of services, such as commuter trains, high-speed trains, and freight trains. These systems help reduce traffic congestion and lower carbon emissions, making them an important part of sustainable transportation.