Passenger rail refers to train services designed to transport people from one location to another. These trains operate on tracks and can range from local commuter trains to long-distance services. They provide an efficient and environmentally friendly alternative to road travel, often connecting cities and regions. Passenger rail systems can include various types of trains, such as subways, light rail, and intercity trains. Many countries invest in these systems to enhance public transportation, reduce traffic congestion, and lower carbon emissions. Popular examples include Amtrak in the United States and Eurostar in Europe.