The M3, officially referred to as the M3 Bakırköy Sahil–Kayaşehir Merkez Metro Line (Turkish: M3 Bakırköy Sahil-Kayaşehir Merkez Metro Hattı), is a 26.7-kilometre (16.6 mi), 19-station^[1] rapid transit line of the Istanbul Metro system on the European part of Istanbul, Turkey. It operates between Bakırköy Sahil and Kayaşehir Merkez. The M3-line is colored light blue on station signs, route signs and the official rapid transit network map.^[1]

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M3 Bakırköy Sahil – Kayaşehir Merkez
M3 Alstom Metroplis AM4 Train at Kayasehir Merkez Station
Overview
Status	Operating
Owner	Istanbul Metropolitan Municipality
Line number	M3
Locale	Istanbul, Turkey
Termini	Bakırköy Sahil Kayaşehir Merkez
Stations	19[1] 1 under construction
Website	M3
Service
Type	Rapid transit
System	Istanbul Metro
Services	1
Operator(s)	Metro Istanbul A.Ş.
Depot(s)	Olimpiyatköy
Rolling stock	80 Alstom Metropolis[1] 4 carriages per trainset
History
Opened	14 June 2013; 10 years ago (2013-06-14) Kirazlı - Başakşehir/MetroKent 8 April 2023; 12 months ago (2023-04-08) Başakşehir/MetroKent - Kayaşehir Merkez 10 March 2024; 42 days ago (2024-03-10) Kirazlı - Bakırköy Sahil, except Yıldıztepe
Technical
Line length	26.7 km (16.6 mi)
Number of tracks	2
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification	1,500 V DC Overhead line
Operating speed	80 km/h (50 mph)
Route map Legend Kayaşehir Merkez Toplu Konutlar Şehir Hastanesi Menekşe Deresi Onurkent MetroKent Başak Konutları Siteler Turgut Özal depot connection to Line M9 İkitelli Sanayi İSTOÇ O-3 Mahmutbey Yenimahalle Line M1B Kirazlı Line M1B Molla Gürani Yıldıztepe İlkyuva Haznedar D.100 Bakırköy—İncirli Line M1A to Halkalı Özgürlük Meydanı to Gebze Bakırköy Sahil This diagram: view talk edit

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The construction of the line began in 2006 following the signing of the related contract in May of that year. By March 2009, the tunnels were completed. The rolling stock was delivered in January 2010, and in December of the same year, the first test run of the trains was accomplished. The line's operation rights were transferred from the İETT bus authority to Istanbul Ulaşım company in June 2011. After the line signalization system was completely installed in March 2012, test runs began in June 2012.^[1] On 11 September 2012 the M3-line started operating unofficially.^[2] The M3-line went into service officially on 14 June 2013.^[3][4] The Ikitelli-Olimpiyat branch was converted into the M9 in May 29, 2021. The northern extension to Kayaşehir Merkez was opened on 8 April 2023.

Özgürlük Meydanı, Haznedar, İlkyuva, Onurkent, Toplu Konutlar and Kayaşehir Merkez stations are bored in situ without removing the ground above, while all other underground stations on the line are built by cut-and-cover method, constructed in a shallow trench and then covered over. The line's tunnels are twin tubes. The Kirazlı-Metrokent and Kirazlı-Bakırköy Sahil sections was constructed by tunnel boring machine (TBM).

The M3 line is 26.7-kilometre (16.6 mi) long, serving 19 stations in total,^[1] with Yıldıztepe station is under construction. The operation control center of the M3-line is situated in MetroKent. The rolling stock and maintenance depots are located in Olimpiyatköy beyond Olimpiyat Parkı Terminal, stretching over an area of (70,000 m² (750,000 sq ft)). The rolling stock depot is capable of holding 180 cars. The maintenance workshop occupies a covered area of 10,000 m² (110,000 sq ft).^[1]

The rolling stock was delivered by the French company Alstom. The fully air-contioned cars, costing each €1.149 million, feature seats covered with antibacterial textile material. It is possible to pass from one car to another in a train to enable a homogeneous distribution of the passenger crowd.^[5]

A total of 80 cars, 20 sets of four-car trains, are able to transport up to 70,000 passenger per hour per direction^[6] between the operating hours from 6:00 h in the early morning to 0:00 h in the midnight. The ride between the terminals Bakırköy Sahil and Kayaşehir Merkez takes 39 minutes. The trains run every five minutes during rush hours.^[1]

All the stations are equipped with closed-circuit video system for continuous monitoring of the platforms. High-level fire safety systems, which include automatic fire extinguishers and fire exits, are installed in the metro line, where non-flammable and fireproofing materials were used.^[1]

Power supply of the line is provided at two different points. In case of power cut at both supply points, an emergency power system that becomes operational within 15 seconds, ensures running of the trains until the next station. If the backup generator system fails, an uninterruptible power source (UPS) supplies energy for emergency lighting and the electronic devices at the operations control center up to three hours. The signalization of the metro line as well as at the depots and railroad switches, also the vehicle drive-control systems are fully automated. However, they can be handled manually when needed.^[1]

All stations are underground.

More information No, Station ...

No	Station	District	Transfer	Notes
1	Bakırköy Sahil	Bakırköy	(Bakırköy Terminal) İETT Bus:	Rauf Orbay St・Ataköy Marina・Galleria・Kennedy St
2	Özgürlük Meydanı		・ (Bakırköy Train Station) İETT Bus: 50B, 71T, 72T, 94A 73B, 76, 76B, 76C, 76V, 76Y, 79B, 89YB, 94Y, 98, 98A, 98AB, 98B, 98D, 98E, 98G, 98H, 98K, 98M, 98MB, 98S, 98T, 98TB, 98Y, 146, E-57	Bakırköy Özgürlük Square・İncirli St・Yusuf Köksal Park・Bakırköy Anadolu imam hatip high school
3	İncirli		・・ İETT Bus: 31, 31E, 50B, 71T, 72T, 73, 73F, 76D, 78ZB, 79G, 79Ş, 82, 89, 89A, 89B, 89K, 89M, 89S, 92, 94, 94A, 94Y, 97, 97A, 97BT, 97E, 97KZ, 97T, H-9, HT13, MK97	Hatice Küçük Park・Bakırköy Adalet Sarayı・İsmail Erak Boulevard・Botanik Park
4	Haznedar	Güngören	İETT Bus: 36CY, 92, 97T, 98D, 98G, 98Y, MK97	Güngören Park・Naci Kazım St・Naci Kazım Park
5	İlkyuva	Bahçelievler	İETT Bus: 36CY, 92, 98D, 98Y	Bağcılar Street・Bahçelievler İSKİ Build
6	Yıldıztepe	Bağcılar	İETT Bus: 36CY, 92, 98D, 98S, 98Y	Bağcılar St・Kıbrıs St・Bağcılar Anadolu High School・Bağcılar Yıldıztepe Primary School・Hoca Ahmet Yesevi Middle School Station Under Construction - Passing
7	Molla Gürani		İETT Bus: 98K, HT10, HT11	Molla Gürani Park・Mehmet Akif Boulevard・Yıldıztepe Park
8	Kirazlı		・ İETT Bus: 92K, 98K, HT10, MK42
9	Yenimahalle		İETT Bus: 92, 92B, 92K, 92Ş, 97G, 98D, 98K, HT13	15 Temmuz Şehit Ramazan Sarıkaya Park・Dökumcüler Street
10	Mahmutbey		İETT Bus: 141K, 141M, 144M, 89C, 89T, 91E, 97E, 97GE, 97M, 98A, 98M, H-1, HT10	Maslak Street・İnönü Street・Bosna Street
11	İSTOÇ		İETT Bus: 143, 146B, 146K, 146M, 31Y, 76O, 78, 89F, 98M	İSTOÇ
12	İkitelli Sanayi	Başakşehir	İETT Bus: 31Y, 82S MK31	Free Transfer
13	Turgut Özal		İETT Bus: 31Y, 78B, 78Ş, 82S, 98KM, 146K, 146M, MK31	Evren Sanayi Site・Süleyman Demirel Boulevard
14	Siteler		İETT Bus: 143, 146B, 146K, 146M, 78C, 79E, 82S, 98KM	Atatürk Bulvarı
15	Başak Konutları		İETT Bus: 78ZB, 89C, 98, 98KM, 143	Prof.Dr Necmettin Erbakan Street・Başakşehir 1.Etap Yürüyüş Yolu Park
16	Başakşehir/MetroKent		Havaist Bus Transfer・Başakşehir/MetroKent - Habibler Metro Line (Plan) İETT Bus: 78, 78BE, 78F, 89C, 98H, 98KM, 146B, MK1, MK22	Metrokent Residences
17	Onurkent	Başakşehir	İETT Bus: 78E, 78F, 78ZB, 89C, 98, 146B, 146K	Onurkent Park・Mimar Kemalettin Street・Akif İnan Anadolu İmam Hatip Lİsesi
18	Şehir Hastanesi		İETT Bus: 36F, 78E, 78F, 78Ş, 79B, 79E, 79F, 79FY, 79GE, 79KM, 79KT, 79T, 146BA, 146F, HS1, HS2, MK1, MK2, MK22, MR50	Başakşehir Çam and Sakura City Hospital
19	Toplu Konutlar		İETT Bus: 36AS, 78E,78G, 78Ş, 79B, 79C, 79E, 79F, 79G, 79K, 79KM, 79KT, 79T, 79Y, MK11	Kayaşehir Boulevard・Kayaşehir Millet Bahçesi
20	Kayaşehir Merkez		İETT Bus: 36F, 78E, 78F, 79F, 79FY, 79GE, 79KM, 79KT, 79M, 146BA, 146F, MK1, MK2	Kayaşehir Boulevard・Başakşehir Millet Bahçesi

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This line is operated by Alstom trains which are visually similar to the AM5-M2 and AM4-M4 trains also built by Alstom that operate on the Budapest Metro. The main difference is that the Istanbul units are equipped with pantographs for overhead line operation only while the Budapest units are equipped with shoegear for third rail operation only.^[1]

• M3 Metro Train
• M3 Mahmutbey Metro Station
• M3 Mahmutbey Metro Station

• Istanbul modern tramways
• Istanbul nostalgic tramways
• Marmaray
• Public transport in Istanbul