TCDD Subdivision 1

4 ft 8+12 in (1,435 mm)ElectrificationOverhead wire
Route map

Legend
To Svilengrad, Sofia and Europe
Turkey/Bulgaria border
Otoyol 3
Tundzha
Edirne
Edirne Wye
Tayyakadın
Abalar
Kırcasalih
To Pythio
To Thessalonika and Athens
Greece/Turkey border
Bayramlı
Edirne/Kırklareli border
Kırklareli
Taşağıl
Otoyol 3
Babaeski
Mandıra
Sarıcaali
Seyitler
Muratlı
Balabanlı
Çorlu
Veliçeşme
BARSAN Global Logistics
BARSAN Global Logistics
Çerkezköy Wye
Çayırdere
Sinekli
Kurfallı
Kabakça
Çatalca
Marmaray Depot
Halkalı Depot
BARSAN Global Logistics
Menekşe
Yeşilköy
Yeşilyurt
Dock Spur
Süreyyaplajı
Cevizli
Atalar
Coşkunoğulları

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.

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.