The subway line, which will be operated on a 9.22 kilometers long, double track route to serve between Tandoğan-Keçiören - among the most crowded areas of Ankara, has been tendered at the end of 2011 by the Ministry of Transportation, Maritime Affairs and Communication General Directorate of Infrastructure Investments. The construction works have been performed by the Gülermak-Kolin-Limak Partnership within the scope of the project that also includes nine passenger stations, and the subway route has been constructed with the cut-and-cover, NATM and TBM tunnel methods.

The route starting with the Ataturk Culture Center (Atatürk Kültür Merkezi - AKM) Station continues with the ASKİ, Dışkapı, Meteoroloji, Belediye, Mecidiye, Kuyubaşı, Dutluk stations respectively, and ends at the Keçiören Şehitler Station. Within the scope of the Tandoğan-Keçiören Subway Line Construction Project, approximately 350 thousand cubic meters of reinforced concrete, 650 thousand cubic meters of excavation, 32 thousand meters of bored pile and 50 thousand square meters of diaphragm wall fabrication has been made. The rail, 3rd rail and switch rail fabrications and the rough constructions, architectural, mechanical and electrical installations works of all stations have been completed.

The project has been completed and taken into operation at the end of 2016.