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M4 (Istanbul Metro)

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M4 Kadıköy–Sabiha Gökçen Airport
Sabiha Gökçen Airport Station
Overview
StatusOperational
Kadıköy - Sabiha Gökçen Airport
Under Construction
M4ʙ (Tavşantepe - Kaynarca Merkez)
Projected
M4ʙ (Kaynarca Merkez - İçmeler/Tuzla Bld.)
Planned
M4ᴀ (Sabiha Gökçen Air. - Kurtköy YHT/ViaPort)
M4ʙ (İçmeler/Tuzla Bld. - Tuzla Sahil)
OwnerIstanbul Metropolitan Municipality
LocaleIstanbul, Turkey
Termini
Stations23
WebsiteM4
Service
TypeRapid transit
SystemIstanbul Metro
Services1
Route numberM4
OperatorMetro Istanbul A.Ş.
DepotMaltepe
Rolling stock144 CAF[1]
4 carriages per trainset
Daily ridership134,524 (2013)[citation needed]
History
Opened17 August 2012 (14 years ago) (2012-08-17)
Last extension2 October 2022 (4 years ago) (2022-10-02)
Technical
Line length33.5 km (20.8 mi)
Number of tracks2
Track gauge1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification1,500 V DC Overhead line
Operating speed80 km/h (50 mph)
Route map

Legend
 Kadıköy Line T3 Ferries in Istanbul İDO Ferries in Istanbul
 Ayrılık Çeşmesi Marmaray
 Acıbadem
 Ünalan Metrobus (Istanbul) M13 (Istanbul Metro)
 Göztepe
 Yenisahra M12 (Istanbul Metro)
 Kozyatağı Line M8
 Bostancı
 Küçükyalı
Maltepe Yard
 Maltepe
 Huzurevi
 Gülsuyu
 Esenkent
 Hastane–Adliye
 Soğanlık
 Kartal
 Yakacık–Adnan Kahveci
 Pendik
 Tavşantepe
Fevzi Çakmak-Hastane M10 (Istanbul Metro)
 Yayalar–Şeyhli M10 (Istanbul Metro)
 Kurtköy M10 (Istanbul Metro)
 Sabiha Gökçen Havalimanı Sabiha Gökçen International Airport Line M5 M10 (Istanbul Metro) HızRay
 Kaynarca Merkez
 Çamçeşme
 Kavakpınar
 Esenyalı
 Aydıntepe
 İçmeler/Tuzla Belediyesi Marmaray

The M4, officially referred to as the M4 Kadıköy - Sabiha Gökçen Airport metro line (Turkish: M4 Kadıköy–Sabiha Gökçen Havalimanı metro hattı), is a 33.5-kilometre (20.8 mi), 23-station[2] rapid transit line of the Istanbul Metro. It is colored deep pink on the maps and route signs. Running between Kadıköy and Sabiha Gökçen Airport, it is the first rapid transit line operating on the Asian side of Istanbul. The M4 mostly runs under State road D100, parallel to the Istanbul-Ankara railway and is entirely underground.

History

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A plan to build a subway line on the Asian side of İstanbul was approved in 2005. In 2008, a €751 million construction contract was awarded to a consortium of Astaldi, Makyol and Gülermak. The rolling stock was ordered from the Spanish company CAF.[3] In mid-2010, the construction of the tunnels was completed and the track laying started. The route has connections with TCDD's Marmaray commuter rail at Ayrılık Çeşmesi and the Istanbul Metrobus system at Ünalan, as well as with line M8 of the metro system at Kozyatağı. The scheduled opening date was December 2011 up to Kartal, but it was postponed because of signalization works.[4]

The M4 opened on 17 August 2012 with a large ceremony in Kadıköy, attended by Prime Minister Recep Tayyip Erdoğan.[3][5][6] On 29 October 2013, with the opening of Marmaray rail service under the Bosphorus, Ayrılık Çeşmesi station was opened to allow passengers to transfer between lines.[7][8] On 10 October 2016, 3 new stations were added to the line (Yakacık Station, Pendik Station and Tavşantepe Station).[9][10][11] On 2 October 2022, 4 new stations were added to the line (Fevzi Çakmak Station, Yayalar Station, Kurtköy Station and Sabiha Gökçen Airport Station).[12] Thus, the length of the line reached 33.5 km.[13]

The addition of 100 new vehicles to the Kadıköy-Sabiha Gökçen Airport metro line fleet is undertaken by Bozankaya.[14]

Opening timeline

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Stage Segment Commencement Length Station(s)
1 Kadıköy – Kartal 17 August 2012 21.7 km (13.48 mi) 16
2 Kartal – Tavşantepe 10 October 2016 4.4 km (2.73 mi) 3
3 Tavşantepe – Sabiha Gökçen Airport 2 October 2022 7.4 km (4.60 mi) 4
4 Tavşantepe – Kaynarca Merkez Early 2027 (expected) 1.1 km (0.68 mi) 1

Stations

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The M4 has a total of 23 stations in operation, with 6 more under construction.

M4 route diagram with M4A and M4B branches
M4 Kadıköy - Sabiha Gökçen Airport
Station District Opened Connections
Kadıköy Disabled access Kadıköy 17 August 2012 Tram interchange Istanbul nostalgic tramways: Istanbul nostalgic tramways#Asian side tram: T3 Line (Kadıköy-Moda Nostalgia Tramway)
Ferries in Istanbul Şehir Hatları
Kadıköy Ferry Terminal İDO
Ferries in Istanbul Turyol
Bus interchange İETT Bus: 1, 3, 3A, 3B, 8, 8A, 11D, 12A, 12H, 13, 13B, 13Y, 14, 14A, 14C, 14D, 14DK, 14E, 14F, 14K, 14KS, 14M, 14R, 14S, 14ŞB, 14Y, 15BK, 15F, 15TK, 16, 16D, 16K, 16KH, 16Y, 17, 17L, 18K, 19, 19EK, 19F, 19S, 21A, 21C, 21G, 21K, 21U, 110, 120M, 125, 130Ş, 222, 319, 500A, 500T
Bus interchange Havabüs
Ayrılık Çeşmesi Disabled access 29 October 2013 Mainline rail interchange TCDD Transport: Marmaray Marmaray
Acıbadem Disabled access 17 August 2012 Bus interchange İETT Bus: 3A, 11T, 13M, 13Y, 14A, 14BK, 14DK, 15BK, 16A, 16B, 16C, 16F, 16KH, 16M, 16U, 16Y, 16Z, 17K, 18E, 18K, 18Y, 18Ü, 19, 19A, 19B, 19E, 19FK, 19H, 19T, 19Z, 20E, 20Ü, 21B, 21C, 21G, 21K, 21U, 130, 130A, 130Ş, 319, 320A, E-10, E-11
Ünalan Disabled access Metrobus (Istanbul) Metrobus: 34A, 34AS, 34G, 34Z
Bus interchange İETT Bus: 3A, 11T, 130, 13M, 13Y, 14A, 14BK, 14DK, 15BK, 16A, 16, B, 16C, 16F, 16KH, 16M, 16S, 16U, 16Y, 16Z, 17K, 17P, 18A, 18E, 18K, 18M, 18Ü, 18V, 18Y, 19, 19A, 19B, 19E, 19FK, 19H, 19T, 19Z, 20E, 20Ü, 21B, 21C, 21G, 21K, 21U, 130A, 130Ş, 319, 320A, E-10, E-11
Bus interchange Havabüs
Göztepe Disabled access Bus interchange İETT Bus: 3A, 8E, 9K, 10E, 10G, 11T, 13M, 13Y, 14A, 14B, 14BK, 14ES, 15BK, 15ÇK, 15SK, 16A, 16B, 16C, 16F, 16KH, 16M, 16S, 16U, 16Y, 16Z, 17K, 17P, 18A, 18E, 18K, 18M, 18Ü, 18V, 18Y, 19, 19A, 19B, 19E, 19FK, 19H, 19T, 19Z, 20D, 20E, 20K, 20Ü, 21B, 21C, 21G, 21K, 21U, 129T, 130, 130A, 130Ş, 202, 251, 252, 319, 320A, E-10, E-11
Yenisahra Disabled access Metro interchange Istanbul Metro: M12 (Istanbul Metro) (under construction)
Bus interchange İETT Bus: 8A, 8Y
Bus interchange Havabüs
Kozyatağı Disabled access Metro interchange Istanbul Metro: Line M8
Bus interchange İETT Bus: 14KS, 14T, 15KB, 16A, 16B, 16C, 16F, 16FK, 16KH, 16S, 16U, 16Y, 16Z, 17K, 17P, 19, 19B, 19FK, 19H, 19Z, 21B, 21C, 21G, 21K, 21U, 129L, 129T, 130, 130A, 130Ş, 251, 252, 319, 500T, E-10
Bostancı Disabled access Bus interchange İETT Bus: 10, 13AB, 14KS, 14T, 15KB, 16A, 16B, 16C, 16F, 16KH, 16S, 16U, 16Y, 16Z, 17K, 17P, 19, 19B, 19D, 19FK, 19H, 19SB, 19Z, 21B, 21C, 21G, 21K, 21U, 129L, 130, 130A, 130Ş, 251, 319, 500T, E-10
Küçükyalı Disabled access Maltepe Bus interchange İETT Bus: 16A, 16B, 16C, 16KH, 16S, 16U, 16Y, 16Z, 17K, 17P, 19B, 19H, 19Z, 21C, 21G, 21K, 21U, 130, 130A, 130Ş, 251, 500T, KM41, KM45
Maltepe Disabled access Bus interchange İETT Bus: 16A, 16B, 16C, 16KH, 16S, 16U, 16Y, 16Z, 17K, 17P, 21C, 21G, 21K, 21U, 130, 130A, 130Ş, 133N, 251, 500T, E-10, KM42, KM43, KM44
Huzurevi Disabled access Bus interchange İETT Bus: 16B, 16C, 16KH, 16S, 16U, 16Y, 16Z, 17K, 17P, 21C, 21G, 21K, 21U, 130, 130A, 130Ş, 133N, 136, 136R, 136Z, 251, 500T, E-10
Gülsuyu Disabled access Bus interchange İETT Bus: 16B, 16C, 16KH, 16S, 16U, 16Y, 16Z, 17K, 17P, 21K, 21U, 130, 130A, 130Ş, 133N, 251, 500T, E-10
Esenkent Disabled access Bus interchange İETT Bus: 16B, 16C, 16KH, 16S, 16U, 16Y, 16Z, 17K, 17P, 21K, 21U, 130, 130A, 130Ş, 500T, E-10, KM30, KM33
Hastane–Adliye Disabled access Kartal Bus interchange İETT Bus: 16C, 16KH, 16S, 16U, 16Z, 17K, 17P, 21K, 17S, 21K, 21U, 130, 130A, 130E, 130Ş, 132G, 134YK, 251, 500T, E-10, KM11, KM21, KM23, KM25, KM29, KM32, KM60, KM70, KM71
Soğanlık Disabled access Bus interchange İETT Bus: 16C, 16KH, 16S, 16Z, 17K, 17P, 21K, 130, 130A, 130E, 130Ş, 132G, 132M, 134GK, 251, 500T, E-10, KM11, KM12, KM21, KM23, KM25, KM29, KM32, KM60, KM70, KM71
Kartal Disabled access Bus interchange İETT Bus: 16C, 16KH, 16S, 16Z, 17K, 17P, 21K, 130, 130A, 130E, 130Ş, 131K, 131V, 131Y, 132C, 132ÇK, 132G, 132M, 132N, 132S, 132T, 132Y, 132Z, 134, 134CK, 134GK, 134K, 134UK, 251, 500T, E-10, KM11, KM12, KM21, KM23, KM25, KM29, KM31, KM32, KM60, KM70, KM71
Yakacık–Adnan Kahveci Disabled access 10 October 2016 Bus interchange İETT Bus: 16C, 16KH, 16Z, 17K, 17P, 130, 130A, 130E, 130Ş, 132G, 132Ş, 132T, 251, 500T, E-10, KM11, KM12, KM23, KM25, KM29
Pendik Disabled access Pendik Bus interchange İETT Bus: 16C, 16KH, 16Z, 17K, 17P, 130, 130A, 130E, 130G, 130Ş, 132, 132A, 132B, 132D, 132E, 132H, 132K, 132P, 132G, 133GP, 132T, 132Y, 251, 500T, E-9, E-10, KM10, KM11, KM12, KM13, KM23, KM24, KM25, KM28, KM29
Tavşantepe Disabled access Bus interchange İETT Bus: 16KH, 17K, 17P, 130, 130A, 130E, 130Ş, 132F, 132T, 132Y, 500T, E-9, KM2, KM10, KM11, KM12, KM13, KM14, KM23, KM24, KM29
Fevzi Çakmak-Hastane Disabled access 2 October 2022 Bus interchange İETT Bus: 16KH, 132P, 132V, 132Y, KM29
Yayalar–Şeyhli Disabled access Bus interchange İETT Bus: 16KH, 132, 132A, 132B, 132D, 132E, 132H, 133GP, 133Ü, E-10, KM18, KM25, KM27, KM28, KM29
Kurtköy Disabled access Bus interchange İETT Bus: 16KH, 132, 132A, 132B, 132D, 132E, 132H, 133GP, 133Ü, E-10, KM18, KM25, KM27, KM28, KM29, KM37
Sabiha Gökçen Airport Disabled access Mainline rail interchange TCDD Taşımacılık: High Speed Train (YHT) Yüksek Hızlı Tren (planned)
Bus interchange İETT Bus: E-3, E-9, E-10, E-11
Bus interchange Havabüs SG-1, SG-2

Specifications

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Kadıköy, Ayrılıkçeşmesi, Ünalan and Göztepe stations are situated below sea level. The average distance between the stations is 1,300 m (1,400 yd). The distance between the stations at Maltepe and Huzurevi is the shortest at 800 m (870 yd). The distance between Bostancı and Küçükyalı is the longest with 2,300 m (2,500 yd). The Operation Control Center of the line is situated in Esenkent and the depot is located in Maltepe. Another depot is to be built in Kaynarca when the line extends there.[15]

Train frequency is currently every 5 minutes during peak hours and technically could be shortened to 90 seconds.[2] Trains remain at stations for an average of 15 seconds. Ridership capacity in one direction is 70,000 passengers hourly. Total travel time of the entire line is around 52 minutes.[2][15]

Rolling stock

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CAF trains

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A Kadıköy-bound CAF train at Pendik station, 2021

In September 2009, the Spanish rail vehicle manufacturer CAF was awarded a contract to supply 30 four-car trains for the line, or 120 cars in total.[16] Later, this order was increased by six trains, for a total of 144 cars.[1] Deliveries of the trains took place from 2011 to 2012.[citation needed] The trains have a maximum speed of 80 kilometres per hour (50 mph) and a total capacity of 1,309 passengers.[17] Out of the total of 36 trains, there are four different exterior and interior designs used.[1]

Bozankaya trains

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Bozankaya cars (middle) at the Behiç Erkin Yard, July 2026

In order to increase capacity on the line following its extension to Sabiha Gökçen Airport in 2022, 25 four-car trains were ordered from Turkish manufacturer Bozankaya to operate on both the M4 and M10 lines in July 2023.[18] The trains, which have a capacity of 1,366 passengers and a maximum speed of 80 kilometres per hour (50 mph), will be capable of operating at the GoA2 (semi-automatic) level of automatic train operation.[19] They are being constructed at Bozankaya's facility in Ankara.[20] The first trainset was delivered in July 2026, with dynamic testing beginning later in August.[21][22] All 100 cars are planned to be in Istanbul by mid-2027.[21]

See also

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References

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  1. 1 2 3 "Kadıköy-Kartal Metro Hattı 144 Adet Metro Aracı Alımı İşi" (in Turkish). İstanbul Büyükşehir Belediyesi. Archived from the original on 2013-10-12. Retrieved 2013-11-16.
  2. 1 2 3 "Kadıköy-Sabiha Gökçen Havalimanı Metro Hattı". metro.istanbul (in Turkish).
  3. 1 2 "Kadiköy - Kartal metro opened by Prime Minister". Railway Gazette International. 17 August 2012. Archived from the original on 19 November 2012. Retrieved 4 October 2015.
  4. ↑ "Kadıköy-Kartal Metro Hattı Temmuzda Açılacak" (in Turkish). İstanbul Net. 2012-03-02. Retrieved 2013-11-16.
  5. ↑ "Yüzde 50 müjdesiyle geliyor". Hürriyet (in Turkish). 2012-08-17. Retrieved 2013-11-16.
  6. ↑ Barrow, Keith (2012-08-17). "Istanbul welcomes Kadiköy – Kartal metro line". International Railway Journal. Retrieved 2026-05-02.
  7. ↑ "Kadıköy - Kartal Metrosu Ayrılıkçeşme İstasyonu ihalesi" (in Turkish). Emlak Kulisi. 2012-07-11. Retrieved 2013-11-16.
  8. ↑ "Marmaray tunnel opens to link Europe with Asia". Railway Gazette International. 29 October 2013. Archived from the original on 29 December 2017. Retrieved 4 October 2015.
  9. ↑ ""HER YERDE METRO, HER YERE METRO" HEDEFİNE YENİ BİR ADIM DAHA!". www.ibb.istanbul (in Turkish). 9 October 2016. Archived from the original on 2016-10-11. Retrieved 2016-10-10.
  10. ↑ Barrow, Keith (2016-10-10). "Istanbul metro Line M4 reaches Kaynarca". International Railway Journal. Retrieved 2026-05-02.
  11. ↑ "Istanbul metro Line M4 extended". Railway Gazette International. 2016-10-10. Retrieved 2026-05-02.
  12. ↑ "Metro to Istanbul's second airport opens". Railway Gazette International. 4 October 2022. Retrieved 2026-01-12.
  13. ↑ Savaş, Barış (2022-09-26). "Pendik Sabiha Gökçen Havalimanı Metro Hattı 2 Ekim'de açılıyor". sabah.com.tr (in Turkish). Retrieved 2022-09-26.
  14. ↑ "100 new vehicles to be added to Kadıköy-Sabiha Gökçen metro line - TOURISMJOURNAL". www.tourismjournal.com.tr.
  15. 1 2 "Kadıköy-Kartal Metro Hattı" (in Turkish). İBB. Archived from the original on 2012-06-04. Retrieved 2012-12-11.
  16. ↑ "CAF wins Istanbul metro train order". Railway Gazette International. 2009-09-15. Retrieved 2026-05-02.
  17. ↑ "METRO ISTANBUL". www.caf.net. Archived from the original on 22 March 2024. Retrieved 2024-03-22.
  18. ↑ "KADIKÖY-SABİHA GÖKÇEN HAVALİMANI METRO HATTINA 100 YENİ ARAÇ GELİYOR". ibb.istanbul (in Turkish). 27 July 2023. Retrieved 3 May 2026.
  19. ↑ "Zero Emission, Maximum Comfort: A New Era of Metro in Istanbul!". bozankaya.com.tr. 17 September 2023. Retrieved 2026-05-02.
  20. ↑ "İBB HEM METRO HATLARI HEM METRO ARAÇLARI YAPIYOR". ibb.istanbul (in Turkish). 13 August 2025. Retrieved 2 May 2026.
  21. 1 2 "İBB'DEN METRO HATLARINA 100 YENİ ARAÇ". ibb.istanbul. 27 August 2026. Retrieved 13 September 2026.
  22. ↑ "Istanbul's First Metro Set Delivered!". bozankaya.com.tr. 31 August 2026. Retrieved 2026-09-13.
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