TCDD District 1 (Turkish: TCDD 1. Bölge) is one of the seven districts of the Turkish State Railways (TCDD). The headquarters are in Haydarpaşa Terminal in Istanbul.

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TCDD District 1
Haydarpaşa Terminal
Overview
Status	Operational
Owner	Turkish State Railways
Locale	European Turkey, western Anatolia
Stations	120
Service
Type	Intercity rail
System	Turkish State Railways
Operator(s)	Turkish State Railways
History
Opened	1876 as the Central Anatolia Railway
Technical
Line length	876 km (544 mi)
Track gauge	4 ft 8+1⁄2 in (1,435 mm)
Electrification	Overhead wire
Route map Legend To Svilengrad, Sofia and Europe Turkey/Bulgaria border Kapıkule Otoyol 3 Tundzha Edirne Edirne Wye Tayyakadın Abalar Kırcasalih To Pythio To Thessalonika and Athens Greece/Turkey border Uzunköprü Bayramlı Edirne/Kırklareli border Pehlivanköy Kırklareli Taşağıl Otoyol 3 Babaeski Mandıra Sarıcaali Lüleburgaz Seyitler Kırklareli/Tekirdağ border Muratlı Balabanlı Çorlu Otoyol 3 Veliçeşme BARSAN Global Logistics BARSAN Global Logistics Çerkezköy Çerkezköy Wye Tekirdağ/İstanbul border Çayırdere Sinekli Kurfallı Kabakça Çatalca Hezarfen Airfield Ispartakule Marmaray Depot Halkalı Depot Halkalı BARSAN Global Logistics Kanarya Soğuksu Küçükçekmece Menekşe Florya Yeşilköy Yeşilyurt Ataköy Bakırköy Yenimahalle Zeytinburnu Kazlıçeşme Yedikule Kocamustafapaşa Yenikapı Kumkapı Cankurtaran İstanbul Dock Spur Bosporus Port of Haydarpaşa Üsküdar Haydapaşa Söğütlüçeşme Kızıltoprak Feneryolu Göztepe Erenköy Suadiye railway station Bostancı Küçükyalı İdealtepe Süreyyaplajı Maltepe Cevizli Atalar Kartal Yunus Pendik Kaynarca Tersane Güzelyalı Aydıntepe İçme Tuzla Coşkunoğulları İstanbul/Kocaeli border Çayırova Fatih Osmangazi Gebze

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Except for the Kırklareli Branch and the Pehlivanköy-Uzunköprü line, the entire district is electrified with over head catenary. The district, at a length of 876 km (544 mi) track, operates part of the Istanbul-Ankara Main Line from Haydapaşa to Polatlı, the old CO main line (Istanbul-Uzunköprü), the Edirne Cut-off, the Adapazarı Branch and the abandoned Kırklareli Branch. The district also operates rail service to the ports of Haydarpaşa and the Port of Derince. The district operates lines from Istanbul to other towns and cities such as: Çerkezköy, Uzunköprü, Edirne, Kapıkule, Gebze, İzmit, Adapazarı, Bilecik, Eskişehir and Polatlı.