M4 (Istanbul Metro)
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The M4, officially referred to as the M4 Kadıköy - Sabiha Gökçen Airport metro line (), is a , 23-station
rapid transit Rapid transit or mass rapid transit (MRT) or heavy rail, commonly referred to as metro, is a type of high-capacity public transport that is generally built in urban areas. A grade separation, grade separated rapid transit line below ground su ...
line of the
Istanbul Metro The Istanbul Metro () is a rapid transit railway network that serves the city of Istanbul, Turkey. Apart from the M11 line, which is operated by TCDD Taşımacılık, the system is operated by Metro Istanbul, a public enterprise controlled by th ...
. It is colored deep pink on the maps and route signs. Running between
Kadıköy Kadıköy () is a municipality and Districts of Turkey, district on the Asian side of Istanbul Province, Istanbul Province, Turkey. Its area is 25 km2, and its population is 467,919 (2023). It is a large and populous area in the Asian si ...
and Sabiha Gökçen Airport, it is the first rapid transit line operating on the Asian side of
Istanbul Istanbul is the List of largest cities and towns in Turkey, largest city in Turkey, constituting the country's economic, cultural, and historical heart. With Demographics of Istanbul, a population over , it is home to 18% of the Demographics ...
. The M4 mostly runs under State road D100, parallel to the Istanbul-Ankara railway and is entirely underground.


History

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 Astaldi S.p.A. is an Italian multinational major construction company based in Rome. The group is active in the fields of civil engineering, hydraulic engineering, electromechanical engineering and transportation. Significant subsidiaries incl ...
, Makyol and Gülermak. The rolling stock was ordered from the Spanish company CAF. In mid-2010, the construction of the tunnels was completed and the track laying started. The route has connections with TCDD's Marmaray system at Ayrılıkçeşmesi and the Istanbul Metrobus system at Ünalan. The scheduled opening date was December 2011 up to
Kartal Kartal () is a municipality and district of Istanbul Province, Turkey. Its area is 38 km2, and its population is 483,418 (2022). It is located on the Asian side of the city, on the coast of the Marmara Sea between Maltepe and Pendik. De ...
, but it was postponed because of signalization works. The M4 opened on 17 August 2012 with a large ceremony in Kadıköy, attended by
Prime Minister A prime minister or chief of cabinet is the head of the cabinet and the leader of the ministers in the executive branch of government, often in a parliamentary or semi-presidential system. A prime minister is not the head of state, but r ...
Recep Tayyip Erdoğan Recep Tayyip Erdoğan (born 26 February 1954) is a Turkish politician who is the 12th and current president of Turkey since 2014. He previously served as the 25th prime minister of Turkey, prime minister from 2003 to 2014 as part of the Jus ...
. On 29 October 2013, with the opening of Marmaray rail service under the
Bosphorus The Bosporus or Bosphorus Strait ( ; , colloquially ) is a natural strait and an internationally significant waterway located in Istanbul, Turkey. The Bosporus connects the Black Sea to the Sea of Marmara and forms one of the continental bo ...
, Ayrılık Çeşmesi station was opened to allow passengers to transfer between lines. On 10 October 2016, 3 new stations were added to the line (Yakacık Station, Pendik Station and Tavşantepe Station). On 2 October 2022, 4 new station were added to the line (Fevzi Çakmak Station, Yayalar Station, Kurtköy Station and Sabiha Gökçen Airport Station). Thus, the length of the line reached 33.5 km. The addition of 100 new vehicles to the Kadıköy-Sabiha Gökçen Airport metro line fleet is undertaken by Bozankaya.


Stations

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


Specifications

The stations Kadıköy, Ayrılıkçeşmesi, Ünalan and Göztepe are situated below sea level. The average distance between the stations is . The distance between the stations at Maltepe and Huzurevi is the shortest at . The distance between Bostancı and Küçükyalı is the longest with . 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 . Train frequency is currently every 5 minutes during peak hours and technically could be shortened to 90 seconds. Trains remain at stations for an average of 15 seconds. Four-car trains have a 1,309 passenger capacity and eight-car trains have 2,618 capacity. Ridership capacity in one direction is 70,000 passengers hourly. Total travel time of the entire line is around 52 minutes.


Rolling stock

M4 is operated by CAF trains (144 cars in total) every 5 minutes during peak hours. The frequency is much less on weekends and during off-peak hours.


See also

* Istanbul modern tramways *
Istanbul nostalgic tramways The Istanbul nostalgic tramways are two heritage streetcar, heritage tramlines in the city of Istanbul, Turkey. The city has two completely separate heritage tram systems, one on the European side (the Taksim-Tünel Nostalgia Tramway, aka. T2 lin ...
* Marmaray *
Public transport in Istanbul Public transport in Istanbul comprises a bus network, various Rail transport, rail systems, funiculars, and sea, maritime services to serve the more than 15 million inhabitants of the city spread over an area of . History Public road transpor ...
*
Istanbul Metro The Istanbul Metro () is a rapid transit railway network that serves the city of Istanbul, Turkey. Apart from the M11 line, which is operated by TCDD Taşımacılık, the system is operated by Metro Istanbul, a public enterprise controlled by th ...


References


External links

* {{Public Transport in İstanbul Istanbul Metro lines Transport infrastructure under construction in Turkey Transport in Kadıköy Ataşehir Maltepe, Istanbul Kartal Pendik Railway lines opened in 2012 Airport rail links in Turkey