M9 (Istanbul Metro)
The M9, officially referred to as the M9 Ataköy-Olimpiyat line, is a rapid transit line of the Istanbul Metro system in the European part of Istanbul, Turkey. It is colored yellow on the maps and route signs.
The line is currently long with 14 stations. It runs along a north-south direction, through five of the city's districts, namely Bakırköy, Bahçelievler, Bağcılar, Küçükçekmece and Başakşehir. The travel time between the end stations is estimated to be 19.5 minutes. It is expected that the metro line will carry around 500,000 riders daily. It will serve about 2.5 million people living in the area and visiting those districts.
Connections to other transit lines are at Ataköy to the Marmaray, at Yenibosna to M1A (Yenikapı–Atatürk Airport), at Çobançeşme to the planned Yenikapı-Sefaköy extension of the M2 line, at Mimar Sinan to the under construction Kirazlı-Halkalı extension of the M1B, at Atatürk Mahallesi to the under construction Mahmutbey-Bahçeşehir-Esenyurt extension of the M7, and at İkitelli Sanayi to M3 (Kirazlı-Başakşehir Olimpiyat).
The construction of the metro line began in February 2016. The line consists of two tubes, which were bored by four tunnel boring machines, two at each end. The city of Istanbul approved of a loan of 338 million to complete the construction.
The first phase of the line, running from Bahariye to Olimpiyat, opened on 29 May 2021. This section included two new stations exclusive to the M9, Bahariye and Masko, as well as three stations which formerly were part of a branch of the M3 line, and which opened in November 2013. The full line up to Ataköy opened on 18 March 2024, with Mimar Sinan station opening later on 30 August 2024.