Seohae Line
Korail Class 391000 EMU.
Overview
Native name	서해선 Seohaeseon
Status	Operational
Owner	Korea Rail Network Authority
Termini	Ilsan Wonsi
Stations	21
Service
Operator(s)	Korail, SEO HAE RAIL CO.,LTD., ERAIL Co., Ltd.
Rolling stock	Korail Class 391000 ITX-Maum
History
Opened	16 June 2018
Technical
Line length	47 km (29 mi) (131 km, future)
Number of tracks	2
Track gauge	1,435 mm (4 ft 8 1⁄2 in)
Electrification	25 kV 60 Hz AC

TheSeohae Line (Korean: 서해선;lit. West Sea Line) is a dual-track, electrified rail line in westernGyeonggi-do andSeoul,South Korea. The Seohae Line is being built in four sections simultaneously. The line runs 47 km (29 mi) south fromIlsan inGoyang City, crosses theHan River, passesGimpo Airport,Sosa,Siheung, and ends in Wonsi inAnsan. There is a transfer to different lines at Daegok, Neunggok, Gimpo Int'l Airport, Bucheon Stadium, Sosa and Choji.^[1] There are currently 21 stations (Ilsan-Wonsi). The line is operated byKorail, but the stations between Sosa and Wonsi are managed by SEO HAE RAIL CO., LTD., a subsidiary ofSeoul Metro.^[2] Since the infrastructure is also owned byKorail, the line runs on the left like the rest of the South Korean mainline railway network.

After the completion of planning, the project was written out as abuild–lease–transfer (BLT) project, andDaewoo was selected^[3] as preferred bidder in September 2008.^[1] Construction was scheduled to last from October 2009 to March 2013.^[4] Due to the2008 financial crisis, it was difficult to gather investors to finance the project, and negotiations stalled.^[1] An agreement was finally signed on 21 December 2010, with construction set to start in the first half of 2011.^[1] Project costs are₩1.5248 trillion; the contractor has altogether seven years for design and construction, and will manage and maintain the line for the first 20 years of operation.^[1]

The first section began construction in 2011 and opened on 16 June 2018.^[5] The second section runs north from Sosa toDaegok on theGyeongui-Jungang Line andSeoul Subway Line 3, with transfers to several other lines. It was expected to open on 29 June 2021,^[6] but did not open until 1 July 2023.^[7][8] Another extension (Daegok-Ilsan) was opened at the end of August 2023.^[9][10] As of October 2024^[update], about ₩4.12 trillion (US$2.98 billion) has been spent on the Seohae Line.^[11]

Another extension (Ilsan-Unjeong) was approved in January 2024.^[12] There is currently no opening date noted.

On 1 September 2010, the South Korean government announced a strategic plan to reduce travel times from Seoul to 95% of the country to under 2 hours by 2020. As part of the plan, the first section is to be further upgraded for 230 km/h (140 mph) the Wonsi–Hwayang extension is to be projected for 250 km/h (160 mph), and the line may seeKTX service.^[13]

Tentative plans foresee the upgrade and incorporation of theGyooe Line, a single-track non-electrified line without passenger service that connectsNeunggok station (with a junction just before Daegok station) andUijeongbu station inUijeongbu. The Uijeongbu–Daegok–Sosa–Wonsi Line would then provide orbital metro service as a northern semicircle around Seoul, complementing the southern semicircle formed by theSuin–Bundang Line.

Another part of the tentative 2010 plans was a southern extension from Wonsi, connecting up with theJanghang Line before Hongseong station.^[14][7] As of April 2023, the construction of this section was 92% completed and was expected to be opened in the second half of October 2024.^[15] However, by late 2024, the opening date of the Wonsi–Seohwaseong extension had been delayed to the first half of 2026.^[16][17]

• Korail Class 391000
• ITX-Maum
• KTX-Eum (from March 2026)

The section from Sosa to Wonsi opened on 16 June 2018. The first phase (Sosa to Daegok) of the Sosa to Ilsan extension opened on 1 July 2023. The second phase (Daegok to Ilsan) of the Sosa to Ilsan extension opened on 26 August 2023. The line currently utilizes seven four-carClass 391000 trains manufactured byHyundai Rotem and ten four-carClass 391000 trains manufactured byDawonsys.

Station number	Station name English	Station name Hangul	Station name Hanja	Transfer	Distance in km	Total distance	Location
S07	Ilsan	일산	一山	(Shared)	---	0.0	Gyeonggi-do	Goyang-si
S08	Pungsan	풍산	楓山		1.9	1.9
S09	Baengma	백마	白馬		1.7	3.6
S10	Goksan	곡산	谷山		1.6	5.2
S11	Daegok	대곡	大谷		1.7	6.9
S12	Neunggok	능곡	陵谷		1.8	8.5
S13	Gimpo Int'l Airport	김포공항	金浦空港		7.4	15.9	Seoul	Gangseo-gu
S14	Wonjong	원종	遠宗		4.3	20.2	Gyeonggi-do	Bucheon-si
S15	Bucheon Stadium	부천종합운동장	富川綜合運動場		2.1	22.3
S16	Sosa (Seoul Theological Univ.)	소사 (서울신대)	素砂		2.7	25.0
S17	Sosaeul (Bucheon Univ. Sosa Campus)	소새울 (부천대 소사캠퍼스)	---		1.7	26.7
S18	Siheung Daeya	시흥대야	始興大也		2.1	28.8		Siheung-si
S19	Sincheon	신천	新川		1.4	30.2
S20	Sinhyeon	신현	新峴		3.3	33.5
S22	Siheung City Hall	시흥시청	始興市廳		3.6	37.1
S23	Siheung Neunggok	시흥능곡	始興陵谷		1.3	38.4
S24	Dalmi	달미	達味		2.4	40.8		Ansan-si
S25	Seonbu (Hando Hospital)	선부 (한도병원)	仙府		1.6	42.4
S26	Choji	초지	草芝		1.7	44.1
S27	Siu	시우	時雨		1.4	45.5
S28	Wonsi	원시	元時		1.5	47.0
S29	Int'l Theme Park(April 2027)	국제테마파크	國際−					Hwaseong-si
S30	Seohwaseong(March 2026)	서화성	西華城

The line is being extended southward from Wonsi to Seohwaseongnamyang. Station names may be subject to change as the line is constructed and various sources give conflicting information.^[18]

Opened on 2 November 2024.

• Transportation in South Korea
• Korail

• Korail(in English)
• SeohaeRail corp. official website(in Korean)

• Seohae Line
• Transport in Seoul
• Railway lines in South Korea
• Seoul Metropolitan Subway lines
• Airport rail links in South Korea
• 25 kV AC railway electrification

• CS1 uses Korean-language script (ko)
• CS1 Korean-language sources (ko)
• All articles with dead external links
• Articles with dead external links from May 2018
• Articles with permanently dead external links
• Use dmy dates from April 2025
• Articles with short description
• Short description is different from Wikidata
• Articles containing Korean-language text
• Articles containing potentially dated statements from October 2024
• All articles containing potentially dated statements
• Articles with Korean-language sources (ko)
• Pages using the Kartographer extension