Comboios are trains that operate on railways, providing a means of transportation for passengers and goods. They are an essential part of public transport systems in many countries, allowing for efficient travel over long distances. Comboios can vary in size and speed, from local commuter trains to high-speed services that connect major cities. In addition to passenger services, comboios also transport freight, playing a crucial role in the economy. They are powered by various energy sources, including electricity and diesel, and are designed to run on tracks laid out in specific routes. The development of comboios has significantly influenced urban planning and mobility.