The Istanbul Metro (Turkish: İstanbul Metrosu) is a rapid transit railway network that serves the city of Istanbul, Turkey. It is operated by Metro Istanbul (known as Istanbul Ulaşım A.Ş. before 2016[3]), a public enterprise, controlled by the Istanbul Metropolitan Municipality. The oldest section is the metro is M1 line, which opened in 1989; it now includes 82 stations in service,[1] with 62 more under construction.