Daejang–Hongdae Line
| Daejang–Hongdae Line | |
|---|---|
| Overview | |
| Native name | 대장-홍대선 |
| Status | Under construction |
| Termini |
|
| Stations | 11 |
| Service | |
| Type | Rapid transit |
| System | Seoul Metropolitan Subway |
| History | |
| Planned opening | First half of 2031 |
| Technical | |
| Line length | 20.029 km (12.445 mi) |
| Number of tracks | 2 |
| Electrification | DC 1500V |
| Daejang–Hongdae Line | |
| Hangul | 대장-홍대선 |
|---|---|
| Hanja | 大壯–弘大線 |
| RR | Daejang-hongdaeseon |
| MR | Taejang-hongdaesŏn |
Daejang–Hongdae Line (Korean: 대장-홍대선) is a subway line under construction in South Korea. It will connect Daejang-dong in Bucheon with Hongik University Station in Seoul. First formally proposed in 2014, it passed a financial feasibility study in 2021 and groundbreaking occurred in late 2025. It will be the first subway line in Korea to combine build-transfer-operate (BTO) and build-transfer-lease (BTL) investment models. The government will contribute 1 trillion KRW and Hyundai Engineering and Construction will contribute 1.1 trillion KRW and share revenue.
Several line extension proposals started to undergo evaluation in early 2026.