The Ansan Line is a railway line connecting Gunpo to Siheung in South Korea.

Services from the Suin Line share tracks with this line between Hanyang Univ.

Since the opening of the Gwacheon Line the trains have been running through to Seoul Subway Line 4.

[citation needed] The line was extended as follows: Express trains stop at stations marked "●" and pass stations marked "|".

[citation needed] Express services stop at all stops beyond Geumjeong station.