The driverless trains, which must be in service by 2015, will have wide inter-car gangways. There must be a minimum of 15% Turkish content apart from the first two trains.

The 20km Line M6, which will be entirely underground, is being built from Üsküdar, where it will connect with the Marmaray rail link under the Bosphorus, via Ümraniye to Çekmeköy and will have 16 stations. A €563.9m contract was awarded in March 2012 to Dogus Insaat ve Ticaret and work started on the project later that month. The line is scheduled to open in May 2015.

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