Line Route Length Stations Notes[27] Kirazlı ↔ Halkalı 9.70 km (on hold) 9 (on hold) Line on hold. Yenikapı ↔ Sefaköy 14 km (tender phase) 11 (tender phase) Line in the tender phase. Başakşehir ↔ Kayaşehir 6.20 km (on hold) 5 (on hold) Line on hold.