M1 (Istanbul Metro)

With Istanbul's population growing and the city rapidly expanding outward, the bus service available in the city became insufficient in the 1970s and 1980s. At that time, the city did not have a mass transit rail system, except for a single 0.57 km (0.35 mi) funicular line known as Tünel – the last operating original tramline was closed in 1969. Istanbul desperately needed a rapid transit rail system to help transport its large population.

The first segment of the M1 line began service on September 3, 1989, between Aksaray and Kocatepe.^[1] On December 18, 1989, the line was extended to Esenler,^[1] but at that time the Otogar (Intercity Bus Station) was omitted. The Otogar station, and the segment between Otogar and Zeytinburnu stations on the M1A branch line, was opened on January 31, 1994.^[1] Following this, the M1A segment between Zeytinburnu and Bakırköy stations was opened on July 3 of the same year.^[1] Further extensions of the M1A line, to Ataköy and then Yenibosna stations, were opened in July and August 1995,^[1] at which point the length of the line reached approximately 16 km. In 1999, a new M1A line station located between Ataköy and Bakırköy stations, the Bahçelievler station, opened. Finally, the M1A branch line was completed on December 20, 2002, when the extension to the World Trade Center and Atatürk AirportinYeşilköy opened.

A rebuilt Esenler station opened on February 22, 2012.^[1] The extension of the M1B branch line from EsenlertoKirazlı opened on June 14, 2013.^[1]

The extension of the M1 line from AksaraytoYenikapı was inaugurated on November 9, 2014, allowing connections with the M2 line and Marmaray commuter rail service, as well as İDO seabus service.^[2][3] Using the M2 and Marmaray, passenger may travel north of the Golden HorntoTaksim, Mecidiyeköy, Levent and Maslak as well as across the BosphorustoÜsküdar and Kadıköy. İDO seabuses offer service to coastal districts of Istanbul as well as other cities and towns on the Sea of Marmara.

A total of 105 trainsets transport up to 400,000 passenger daily between the operation hours from 6:00 in the early morning to 0:00 in the midnight.^[1] The M1 line has a maximum headway of 2 ½ minutes during peak hours.^[1] All stations have covered seating. A total of 135 escalators and 65 elevators make access to the stations easy for passengers.^[1]

The M1A line is 20 kilometers (12 mi) long in total,^[4] and serves 18 stations. The trip between the termini stations, Yenikapı and Atatürk Airport, takes approximately 35 minutes.^[2] Daily, 169 trains run in each direction between the termini stations, with a peak-hour headway of 6 minutes.^[2]

On the M1A line, seven stations are built underground, nine are ground-level stations, and three are elevated. The stations are so structured that six of them have island platforms and eleven stations have side platforms. The connection station at Otogar in Esenler has two island platforms, which enable traffic on three tracks by the two different M1 branch lines.^[2]

The M1B line is 14.0 kilometers (8.7 mi) long in total,^[5] and serves 13 stations. The trip between the termini stations, Yenikapı and Kirazlı, takes approximately 25 minutes.^[6] Daily, 168 trains run in each direction between the termini stations, with a peak-hour headway of 4 minutes.^[6]

On the M1B line, eight stations are built underground and five are ground-level stations. The stations are so structured that eight of them have island platforms and four stations have side platforms. The connection station at Otogar in Esenler has two island platforms, which enable traffic on three tracks by the two different M1 branch lines.^[6]

As of November 2020,^[update] a 9.7 kilometers (6.0 mi) extension to a new terminus station at Halkalı is under construction. It will add nine stations to the M1B branch, west of Kirazlı offering an interchange with both the Marmaray and M11 lines.^[7]

Since this line is the oldest modern rail line in İstanbul, it has relatively old vehicles, produced by ABB in 1988. The vehicles reach a maximum speed of 80 km/h with an acceleration of 0.7 m/s².

• Istanbul modern tramways – Separate modern tramways (T1, T4 & T5) of Istanbul
• Istanbul nostalgic tramways – Two separate heritage tramways of Istanbul
• Trams in Istanbul – the first generation tramway network
• Marmaray
• Public transport in Istanbul – includes information on trams
• EsTram (Eskisehir)
• Antalya trams
• Kayseri tram (Kayseray)

  Media related to Istanbul Metro line M1 at Wikimedia Commons

• İstanbul Ulaşım – M1 Yenikapı – Ataturk Airport / Kirazlı LRT Line (official webpage) (in Turkish)

41°00′13″N 28°53′37″E / 41.0035°N 28.8937°E / 41.0035; 28.8937