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| Gebze–Haydarpaşa railway | |
|---|---|
| Name | Gebze–Haydarpaşa railway |
| Native name | Gebze–Haydarpaşa demiryolu |
| Type | Commuter rail, intercity rail |
| System | Turkish State Railways |
| Status | Partially closed for upgrades |
| Locale | Istanbul Province, Kocaeli Province |
| Start | Haydarpaşa |
| End | Gebze |
| Stations | 21 (historical) |
| Open | 1873 |
| Owner | Turkish State Railways |
| Operator | TCDD Taşımacılık |
| Line length km | 43 |
| Tracks | Double track (historical) |
| Electrification | 25 kV AC (since 1969) |
| Map state | collapsed |
Gebze–Haydarpaşa railway is a historic 19th–20th century rail corridor connecting the Anatolian suburbs of Istanbul with Kocaeli Province and key nodes on the Anatolian Railway network. Built by foreign concessionaires in the Ottoman era and later nationalized, the corridor served as a backbone for commuter traffic, intercity links and freight between Haydarpaşa Terminal, Kadıköy, Pendik, and Gebze until phased closures for the Marmaray project and high-speed upgrades.
The route originated from concessions granted to the Anatolian Railway (Anadolu Demiryolları) and the Chemins de fer ottomans d'Anatolie in the late Ottoman period, with early construction influenced by financiers from Germany, United Kingdom, and the Ottoman Bank. The line opened in stages after 1873, linking Haydarpaşa Terminal to Gebze and integrating with lines toward Ankara, Izmit, and the Sivas corridor. During the World War I and the Turkish War of Independence, the corridor was strategic for troop and supply movements involving forces from the British Empire, Ottoman Empire, and later Grand National Assembly. Republic-era developments under leaders like Mustafa Kemal Atatürk and administrations of the Republic of Turkey saw nationalization into State Railways and Seaports Administration and later Turkish State Railways (TCDD). Electrification in 1969 and suburban service reorganizations in the 1970s aligned with urban expansion under municipal authorities such as Istanbul Metropolitan Municipality.
The alignment ran east–west along the southern shore of the Marmara Sea, departing Haydarpaşa Terminal near Kadıköy and following coastal embankments past districts including Maltepe, Kartal, Pendik, Tuzla, before reaching Gebze adjacent to Dilovası. Major civil engineering works included the construction of bridges over the Riva River and viaducts crossing industrial zones serving terminals linked to Haydarpaşa Port and marshalling yards near Sirkeci, with connections toward the Istanbul-Ankara high-speed railway. Stations exhibited architectural influences from Ottoman architecture, Neoclassical architecture, and later Republican architecture, with heritage sites such as the original Haydarpaşa station building becoming focal points for preservation debates involving institutions like UNESCO and the Ministry of Culture and Tourism (Turkey).
Prior to closures, services on the corridor included suburban commuter operations known as the Haydarpaşa suburban line, intercity expresses to Ankara and Izmir via links to İzmit and Eskişehir, and regional freight traffic connecting to industrial centers in Kocaeli and ports serving Mediterranean and Black Sea logistics chains. Operators transitioned from the historic Ottoman Railway Company to TCDD Taşımacılık after reforms under transport ministries and EU-inspired transport policy changes. Timetables once coordinated with ferry services at Haydarpaşa Terminal to Sirkeci and integrated with urban transport modes including Istanbul Metro, IETT bus networks, and suburban rail planning by the Ministry of Transport and Infrastructure (Turkey).
Rolling stock evolved from 19th-century steam locomotives supplied by firms in Germany, United Kingdom, and United States to electric multiple units (EMUs) introduced after 1969, including models analogous to procurement programs involving TÜVASAŞ, ASELSAN, and joint ventures with international manufacturers like Siemens and Alstom. Freight consisted of wagons serving petrochemical complexes in Tuzla and heavy industry in İzmit coordinated with marshalling yards and container terminals at Haydarpaşa Port. Maintenance facilities and depots at Gebze and Haydarpaşa supported shunting locomotives, inspections, and workshop overhauls in collaboration with industrial suppliers and trade unions active in the rail sector, such as Türk-İş affiliates.
The corridor underwent major interventions as part of the Marmaray project and the construction of the Bosphorus rail tunnel, prompting partial closures for rehabilitation, track realignment, and platform reconstruction overseen by the General Directorate of Highways (KGM) and Ministry of Transport and Infrastructure (Turkey). Plans for integration with the İstanbul-Ankara High-Speed Rail included gauge-compatible works, signaling upgrades to ETCS standards, and station redevelopment to meet urban renewal programs championed by the Istanbul Metropolitan Municipality and investors from European Investment Bank-backed initiatives. Phased service suspensions and depot relocations provoked public debate involving heritage NGOs, commuter associations, and municipal councilors.
Throughout its operational history, the corridor experienced incidents ranging from derailments near industrial sidings to collisions at level crossings managed by municipal authorities, with investigations sometimes conducted by bodies linked to the Ministry of Transport and Infrastructure (Turkey) and judicial inquiries involving prosecutors in Istanbul. Wartime damage during World War I and sabotage episodes in periods of political unrest affected operations, while safety reforms followed high-profile accidents that spurred changes to signaling, level crossing protections, and employee training programs overseen by trade unions and regulatory agencies.
The corridor shaped suburban growth patterns in Kadıköy District, Kartal District, and Pendik District, influencing urbanization, housing markets, and industrial zoning in Istanbul Province and Kocaeli Province. It featured in literature, photography, and film connected to cultural institutions like the Istanbul Modern and festivals commemorating maritime and rail heritage, while also underpinning commerce at Haydarpaşa Port and logistics providers servicing Anadolu manufacturing clusters. Debates over conservation of station architecture engaged heritage organizations, municipal planners, and investors in redevelopment schemes tied to broader transformations in Turkey's transport infrastructure and urban policy.
Category:Rail transport in Turkey Category:Istanbul Province Category:Kocaeli Province Category:Railway lines opened in 1873