The Rio de Janeiro Metro (Portuguese: MetrôRio IPA: [meˌtɾo ˈʁi.u], commonly referred to as just the Metrô [Meˈtɾo]) in Rio, is a mass-transit underground railway network that serves the city of Rio de Janeiro, Brazil. The Metrô was inaugurated on March 5, 1979, with five stations operating on one line. The system now covers a total of 58 kilometres (36 mi), serving 41 stations, divided into three lines: Line 1 (16 kilometres (9.9 mi)), Line 2 (30.2 kilometres (18.8 mi)), which together travel over a shared stretch of line that covers 10 stations and an approximate distance of 5 kilometers, and Line 4 (16 kilometres (9.9 mi)).