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M3 (Istanbul Metro)
M3, officially referred to as the M3 Kirazli-Basaksehir-Olimpiyatkoy Metro Line ((トルコ語:M3 Başakşehir Metro Hattı)), is a , 11-station〔 rapid transit line of the İstanbul Metro system on the European part of Istanbul, Turkey. It operates between Kirazlı-Bağcılar, extending the service of the M1B line from Aksaray, to Başakşehir-Metrokent or Olimpiyat, branching off at the İkitelli Sanayi junction station. The M3-line is colored light blue on station signs, route signs and the official rapid transit network map.
==Construction==
The construction of the line began in 2006 following the signing of the related contract in May of that year. By March 2009, the tunnels were completed. The rolling stock was delivered in January 2010, and in December of the same year, the first test run of the trains was accomplished. The line's operation rights were transferred from the İETT bus authority to İstanbul Ulaşım company in June 2011. After the line signalization system was completely installed in March 2012, test runs began in June 2012.〔 On September 11, 2012, the M3-line started operating unofficially. The M3-line went into service officially on June 14, 2013.
Ziya Gökalp Mahallesi Station is the only underground station bored in situ without removing the ground above, while all other underground stations on the line are built by cut-and-cover method, constructed in a shallow trench and then covered over. The line's tunnels are twin tubes. The line between Kirazlı and MetroKent was constructed by tunnel boring machine (TBM) while the line between Sanayi Mahallesi and Olimpiyat Parkı was built using the New Austrian Tunnelling method (NATM).〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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