The Porto Metro is a rapid transit system serving the city of Porto, Portugal, and its surrounding areas. It consists of six lines, identified by colors and letters, connecting key neighborhoods, commercial areas, and the Francisco Sá Carneiro Airport. The system is known for its efficiency and modern trains. Opened in 2002, the Porto Metro has expanded over the years, making it an essential mode of transportation for residents and tourists alike. The network covers approximately 67 kilometers and includes 82 stations, providing easy access to various attractions, including the historic Ribeira District and the iconic Dom Luís I Bridge.