Istanbul Kadikoy-Kartal Metro Line



Istanbul Metropolitan Municipality

Avrasya Metro Group (Astaldi, Makyol, Gulermak)

Features / Capacity / Area
21.7 km / 16 Stations / Depot and Maintenance Facility

Contract Date
2009 May

The M4 metro is the first underground metro line in Anatolian side of Istanbul.


The designed line starts from Kadikoy square, connects with Marmaray line at Ayrilikcesme station, moves along D100 route in Acibadem region and ends at Kartal station.


There is a 52-car (13 trains) depot and a 32-car maintenance workshop at Maltepe Station region between Maltepe and Huzurevi stations. The entire line was built under the ground including the depot and workshop areas. Commissioning date of the phase 1 is August 2012.


Operational Data of the whole line:

  • Total Line Length: 33, 5 Km.
  • Number of Stations: 23
  • Number of Cars: 144 (36 units of 4-car series)
  • Journey Duration: 52 min.
  • Passenger Capacity: 70.000 Passengers/Hour
  • Projected Journey Frequency: 90 Sn. (Ideal), 120 Sn. (Actual)
  • Journey Frequency: 5 min. (during peak hours)

Preliminary, final and detail (construction) design services for the metro rail system have been prepared by Prota.


The design services provided by Prota within the scope of the project are summarized below:

  • Alignment, rail and track design
  • TBM, NATM and cut-and-cover tunnel
  • Architecture, interior design and finishing works
  • Structural systems
  • Geological and geodetic studies, geotechnical studies, reports and excavation shoring projects
  • Mechanical ventilation, heating-cooling, plumbing systems,
  • Fire projects (station and tunnel fire detection and fighting, gas-water extinguishing, smoke removal and escape route pressurization)
  • Electrical Projects (3rd rail, power installation, low voltage, MV system, lighting, socket, UPS, routing and grounding system projects)
  • Power supply, traction transformers and ring system
  • Communication design (CCTV, announcement, passenger information, emergency call, clock, radio system, driver platform monitoring, entrance security, line-wide radio system, tunnel radio and fiber optic cabling)
  • Acoustic Modeling Reporting (building acoustics, line vibration, noise analysis)
  • Environmental planning (landscape, road-traffic regulation, traffic displacement, Infrastructure and infrastructure displacement and drainage)
  • CFD, SES, piston effect simulations
  • Signaling and safety system
  • Zoning plan amendment proposals, expropriation documents
  • Scada system
  • Depot and maintenance facility design
  • BoQ and technical specification preparation
  • Technical consultancy for construction works
  • As-built drawings

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