Marmaray

In Istanbul’s transportation map, the Marmaray line, designated as B1 (Suburban Line 1), is one of the city’s longest rail systems and extends as far as Gebze within the boundaries of Kocaeli province. This line connects the continents of Asia and Europe beneath the seabed and is among the largest infrastructure projects implemented in Istanbul in recent decades. With high passenger capacity, Marmaray plays a critical role in both urban transit and intercity rail connections.

The origins of the Marmaray project date back to the Ottoman period. The idea of linking the two continents beneath the Bosphorus was first proposed in 1860 during the reign of Sultan Abdülmecid, with a submarine tunnel project titled “Cisr-i Enbubi” designed by French engineer Prerault aiming to connect Sirkeci and Haydarpaşa stations.

In 1892, the plan was redrawn under Sultan II. Abdülhamid. However, technological limitations of the era and subsequent wars prevented the project from being realized.

^{First planned project during the Ottoman period. (}Anadolu Agency⁾

In the 1980s, the idea of connecting Asia and Europe by rail resurfaced, and feasibility studies were conducted in 1987 during the government of Turgut Özal. The project re-emerged in the 2000s and was officially launched in May 2004 with the approval of then-Prime Minister Recep Tayyip Erdoğan. Tunnel excavation began on 21 December 2006. The deepest point of Marmaray is a tubular tunnel reaching 60 meters below the surface of the Sea of Marmara.

The project was temporarily halted due to archaeological discoveries at the excavation site in Yenikapı. Archaeological rescue excavations, which began in 2004, continued until 2013. After each find was carefully recovered and studied, construction resumed. On 4 August 2013, the first test run of Marmaray was conducted by a delegation led by Prime Minister Recep Tayyip Erdoğan.

On 29 October 2013, marking the 90th anniversary of the Republic of Türkiye, the first phase of Marmaray opened, serving the 13.6-kilometer section between Kazlıçeşme (Europe) and Ayrılıkçeşmesi (Anatolia). The stations along this route are Ayrılıkçeşmesi, Üsküdar, Sirkeci, Yenikapı, and Kazlıçeşme.

^{Inauguration of Marmaray. (}Anadolu Agency⁾

The inauguration ceremony at Üsküdar Square was attended by President Abdullah Gül, Prime Minister Recep Tayyip Erdoğan and his wife Emine Erdoğan, Somali President Hasan Sheikh Mahmud, Speaker of the Grand National Assembly Cemil Çiçek and his wife Gülten Çiçek, Japanese Prime Minister Shinzo Abe, Romanian Prime Minister Viktor Ponta, and Minister of Transport Binali Yıldırım, who all traveled together on the inaugural train.

After completion, Marmaray not only connected the European and Asian sides of Istanbul but also became a strategic transit point enabling uninterrupted rail travel between Beijing and London.

^{First journey of Marmaray (}Anadolu Agency⁾

Before Marmaray opened, an average of 140,000 passengers crossed each of the two Bosphorus bridges in one direction per hour. After its opening, this number dropped to 75,000, demonstrating that Marmaray had absorbed a significant portion of the transportation burden in a megacity like Istanbul. Several years after the initial line opened, the Gebze–Halkalı section was inaugurated on 12 March 2019 at a ceremony held at Istanbul Kartal Square, attended by President Recep Tayyip Erdoğan.

^{Cutting the ribbon at the Marmaray inauguration (}TCDD⁾

Thus, the total length of the Marmaray line reached 76.6 kilometers with 43 stations. The travel time between Gebze and Halkalı is 108 minutes. As of 2023, the 10-year record of Marmaray shows that total passenger numbers have exceeded one billion.

1. Anatolian Side: Gebze, Darıca, Osmangazi, GTÜ–Fatih, Çayırova, Tuzla, İçmeler, Aydıntepe, Güzelyalı, Tersane, Kaynarca, Pendik, Yunus, Kartal, Başak, Atalar, Cevizli, Maltepe, Süreyya Plajı, İdealtepe, Küçükyalı, Bostancı, Suadiye, Erenköy, Göztepe, Feneryolu, Söğütlüçeşme, Ayrılıkçeşmesi, Üsküdar.

2. European Side: Sirkeci, Yenikapı, Kazlıçeşme, Fişekhane, Yenimahalle, Bakırköy, Ataköy, Yeşilyurt, Yeşilköy, Florya Akvaryum, Florya, Küçükçekmece, Mustafa Kemal, Halkalı.

^{Marmaray stations (}