Istanbul Metro. Kadıköy - Kartal Line (M4 Line)


Istanbul Metropolitan Municipality (IMM) / Avrasya Metro Group JV

Cost of works:

€ 551 million

Period of Activity:

2008 - 2010

Istanbul is a megalopolis with over 15-million inhabitants, still growing and expanding, characterized by a mixture of historic heritage, natural beauty, and uncontrolled urbanization. Mobility is the biggest problem of the city, also due to its unique location, divided in two parts by the Bosporus Strait, which separates the Anatolian from the European side of the city. M4 Line crosses the densely-populated Anatolian side of the city from Kadıköy Station to Kartal Station and it is part of the new and ambitious mass transport program of the Turkey Government to put into operation over 500 km of new metro lines by 2025. The line entered in operation in August 2012.

— Project Description:

The new metro line of Istanbul from Kadıköy to Kartal is 21.7km long with new 16 underground stations. The line is completely underground, with a variable cover equal to 20-40m and its construction involved the use of all available tunneling technologies including conventional methods, cut and cover, and mechanized techniques. All the stations (platform and connection tunnels of the stations), the switch tunnels and more than 50% of the running tunnels were excavated using conventional tunnelling methods. The alignment also includes 9 cross-over caverns (twin tunnels with the pillar removed), more than 20 access tunnels for the construction phase, about 60 shafts for ventilation and elevators near the stations and several connection tunnels.

— Description of Services:

Detailed Design of the tunnels and underground stations and Construction follow-up of all the underground works (except for the running tunnels excavated with TBM).

GEODATA fornisce soluzioni sostenibili e ad alto valore aggiunto per progetti in sotterraneo che soddisfano le crescenti esigenze di trasporto e di sviluppo sostenibile.


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