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 public transportation in many cities and regions, providing a reliable and efficient way to travel. These systems can vary in size and complexity, from local commuter trains to long-distance freight trains. Major components include railway tracks, train stations, and signal systems that ensure safe travel. Train systems contribute to reducing traffic congestion and lowering carbon emissions compared to road transport.