Suin Line
The original Suin Line opened on August 5, 1937 by the privately owned Chosen Gyeongdong Railway. Its name came from Suwon-Incheon. The 52 km (32 mi) route connected Suwon to Namincheon (Nam means south) via Ansan and Siheung. Intially built for hauling salt from Sorae Port, passenger services soon started on the line. It was one of the few narrow-gauge railways in South Korea.
The line was taken over by the Chosen Railway (The largest private railway company in Korea at that time) in 1942, and was nationalized in 1945. Korail continued to run the line until the entire route was closed on December 31, 1995.
A section of the old track visible near Gojan Station on Line 4.
By myself (User:Piotrus) - Self-photographed, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=26957461
Sections of the old line can be seen throughout the countryside.
By Jpbarrass - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=16761867
Suwon Station on the original line, a transfer station with the Gyeongbu Line (now part of Line 1).
The final passenger services on the original line before its closure.
Since December 28, 2004, the line is being reconstructed with standard gauge, double tracking, and electrification. It is planned to be opened in three phases. It is marked with the same yellow color as the Bundang Line on maps.
The first phase opened on June 30, 2012, from Oido to Songdo.
By 안양역(ksrt6848@naver.com) - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=22525543
On December 27, 2014, Darwol Station opened between Oido and Wolgot.
Phase 2 opened on February 27, 2016, extending the line westward form Songdo to Incheon. This completed the current line.
All northbound trains terminate at Oido, and all southbound trains terminate at Incheon.
Express service was launched on July 10, 2017. This service stops only at Oido, Soraepogu, Incheon Nonhyeon, Woninjae, Yeonsu, Inha University, and Incheon.
The current line is 25.9 km (16.1 mi) long. All track is on the left-hand side.
Trains are six cars long, but platforms are built for eight. They can be extended to accommodate ten cars if necessary.
All trains are stored at the Siheung Depot on Line 4.
A map of Phase 3. Note: there will be two more stations between Eocheon and Suwon, Omokcheon and Gosaek.
By 안양역(ksrt6848@naver.com) - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=22525543
Phase 3 will open in September 2020. It will extend the line east from Oido to Suwon, allowing for through service to the Bundang Line. It is planned for these two lines to merge into one long line from Cheongnyangni to Incheon, tentatively called the Suin-Bundang Line. This phase will share track with Line 4's Ansan Line from Oido to Hanyang University.
Hagik Station between Songdo and Inha University will open in the later half of 2020.
In addition, a connecting line from Songdo to Incheon will open in 2022, allowing KTX trains to run on the line.
Third generation Korail Class 351000 train 351x67 (before repaint)
By 충북선 무궁화호 at Korean Wikipedia, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=80150176
You can read more about the trains running on this line here.
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