Ansan Line
The Ansan Line is a railway line connecting Gunpo to Siheung in South Korea. Services on this line run through train services into Seoul Subway Line 4 via the Gwacheon Line. Services from the Suin Line share tracks with this line between Hanyang Univ. –Oido.
History
In 1988 the section between Geumjeong–Ansan opened as a branch line of Gyeongbu Line with through train service to Seoul Subway Line 1. Since the opening of the Gwacheon Line the trains have been running through to Seoul Subway Line 4. The line was extended as follows:| Date | Section | Length |
| 25 October 1988 | Geumjeong–Hanyang Univ. –Ansan | 19.5 km |
| 28 July 2000 | Ansan–Oido | 6.5 km |