The original Janghang Line was opened along its full length running between Cheonan and Janghang by the
Chosen Gyeongnam Railway on June 1, 1922.
Upgrade The entire Janghang Line is being electrified, double-tracked, and upgraded for higher speeds with a straighter alignment. Work started in 1997 from Cheonan. By the end of 2008, the new alignment was in service from Cheonan via Asan and Hongseong to Sinseong, from Jupo to Nampo, and from Ganchi to Janghang, and electrification was put in service on the first between Cheonan and
Sinchang, after Asan, on December 15, 2008. The section near Janghang, opened in December 2007, also linked up the Janghang Line with the previously isolated Iksan-Gunsan line via a new bridge over the
Geum River, with alignment built for two tracks but initially only one track was laid. As of April 2023, the double-tracking of the Sinchang-Hongseong section was 85% completed and expected to be opened in the second half of 2024. Also as of April 2023, the double-tracking of the Hongseong-Daeya section, including the Sinseong-Jupo realignment that was scheduled to begin construction in 2023, was in advanced planning, with a 2027 completion targeted. ==Services==