Gyeongui Line
The Yongsan Line () is a branch railroad of the Gyeongui Line, currently in service on the Gyeongui-Jungang Line. It connects Yongsan Station to Gajwa Station on the Gyeongui Line. The line was abandoned in 2005, but was reopened as an underground subway line in 2012 from Gajwa Station to Gongdeok Station and in 2014 from Gongdeok Station to Yongsan Station.