Seoul Subway Line 4

Line 4
Line 4
	Seoul Metro 4000 series EMU in January 2007; (up); Korail Class 341000 series EMU in January 2021; (down)
Overview
Native name	4호선（四號線）; Sa Hoseon
Status	Operational
Termini	Danggogae; Oido
Stations	48; 26-Seoul Metro; 22-Korail
Service
Type	Rapid transit
System	Seoul Metropolitan Subway
Operator(s)	Seoul Metro & Korail
History
Opened	20 April 1985
Technical
Line length	72.1 km (44.8 mi); 31.7 km (19.7 mi) Seoul Metro; 40.4 km (25.1 mi) Korail
Number of tracks	2
Electrification	1,500 V DC (Danggogae to Geumjeong); 25 kV AC at 60 Hz (Geumjeong to Oidio)

Seoul Metropolitan Subway Line 4 (dubbed The Blue Line) of the Seoul Metropolitan Subway is a long line crossing from the southwest to the northeast across the Seoul National Capital Area. The central section in Seoul City is operated by Seoul Metro with some trains offering through service to Korail's Ansan and Gwacheon Lines.^[3] The southern terminus (Oido) is in Jeongwang 4-dong, Siheung City, and the northern terminus (Danggogae) is in Sanggye 4-dong, Nowon-gu, northern Seoul. In 2019, the Seoul Metro operated section had an annual ridership of 327 million or about 895,000 passengers per day.^[4]

All northbound trains terminate at Danggogae, except during night time where they short-turn at various stations. Half of the southbound services short-turn at Sadang, and another half head to Oido or Ansan. Express train service stops at all stations between Danggogae and Sanbon, then at Sangnoksu, Jungang, Choji, Ansan, Jeongwang, and Oido. The express service only operates during rush hours on weekdays.

History[]

1985:

April 20: Line 4 is officially opened from Sanggye to Samseon-gyo.

1993:

April 21: The line is extended northward from Sanggye to Danggogae.

1994:

April 1: The line is extended southward from Sadang to Ansan when a section of the Gwacheon Line (from Seonbawi to Indeogwon) and Namtaeryeong Station open.

2000:

July 28: The line is extended westward from Ansan to Oido.

2003

July 18: Surisan Station opens as an in-fill station on the Ansan Line section.

2010

Ansan Line AM express service is launched in the northbound direction only (starting from Ansan). Trains stopped at Jungang, Sangnoksu, and Sanbon, before continuing local up to Danggogae.

2014

September 1: Southbound PM express service is launched (terminating at Ansan). Trains make the same stops as their AM express service counterparts.

2017

July 7: Express service is extended to Oido. In addition to the stops they made before, trains make all stops between Ansan and Oido.

2020

September 12: Express service is modified, with trains now stopping at Choji but skipping Neunggil.

Future[]

The Transportation and Construction Committee of the National Assembly approved an extension from the northern end of Line 4 (Danggogae) to Jinjeop, Namyangju. Construction began on December 10, 2014 and is expected to be completed by March 2022.^[5] In addition, express services are planned to start skipping various stations north of Sanbon station by 2023 to cut travels times.^[6]^[7]

Stations[]

Station Number	Station Name English	Station Name Hangul	Station Name Hanja	EX	Transfer		Line Name	Distance in km	Total Distance	Location

405	Jinjeop (March 2022)	진접	榛接	No service			Jinjeop Line			Gyeonggi-do	Namyangju
406	Onam (March 2022)	오남	梧南
407	Pungyang (TBD)	풍양	豊壤
408	Byeollae Byeolgaram (March 2022)	별내별가람	別內別가람
409	Danggogae	당고개	당고개	Makes all stops			Seoul Metro Line 4	---	0.0	Seoul	Nowon-gu
410	Sanggye	상계	上溪					1.2	1.2
411	Nowon	노원	蘆原					1.0	2.2
412	Chang-dong	창동	倉洞					1.4	3.6		Dobong-gu
413	Ssangmun	쌍문	雙門					1.3	4.9		Dobong-gu
414	Suyu (Gangbuk-gu Office)	수유 (강북구청)	水踰 (江北區廳)					1.5	6.4		Gangbuk-gu
415	Mia (Seoul Cyber University)	미아 (서울사이버대학)	彌阿 (서울사이버大學)					1.4	7.8
416	Miasageori	미아사거리	彌阿사거리					1.5	9.3
417	Gireum	길음	吉音					1.3	10.6		Seongbuk-gu
418	Sungshin Women's University (Donam)	성신여대입구 (돈암)	誠信女大入口 (敦岩)					1.4	12.0
419	Hansung University (Samseongyo)	한성대입구 (삼선교)	漢城大入口 (三仙橋)					1.0	13.0
420	Hyehwa (Seoul Nat’l Univ. Hospital)	혜화 (서울대학교병원)	惠化					0.9	13.9		Jongno-gu
421	Dongdaemun	동대문	東大門					1.5	15.4		Jongno-gu
422	Dongdaemun History & Culture Park	동대문역사문화공원	東大門歷史文化公園					0.7	16.7		Jung-gu
423	Chungmuro	충무로	忠武路					1.3	17.4
424	Myeongdong (Jeonghwa Arts College)	명동 (정화예술대)	明洞					0.7	18.1
425	Hoehyeon (Namdaemun Market)	회현 (남대문시장)	會賢 (南大門市場)					0.7	18.8
426	Seoul Station	서울역	서울驛		(Seoul Station branch) Mugunghwa-ho and ITX-Saemaeul services			0.9	19.7		Yongsan-gu
427	Sookmyung Women's University (Garwol)	숙대입구 (갈월)	淑大入口 (葛月)					1.0	20.7
428	Samgakji	삼각지	三角地					1.2	21.9
429	Sinyongsan	신용산	新龍山					0.7	22.6
430	Ichon (National Museum of Korea)	이촌 (국립중앙박물관)	二村 (國立中央博物館)					1.3	23.9
431	Dongjak (Seoul National Cemetery)	동작 (현충원)	銅雀 (顯忠院)					2.7	26.6		Dongjak-gu
432	Chongshin University (Isu)	총신대입구 (이수)	總神大入口 (梨水)					1.8	28.4
433	Sadang (Daehang Hospital)	사당 (대항병원)	舍堂					1.1	29.5
434	Namtaeryeong	남태령	南泰嶺					1.6	31.1		Seocho-gu
435	Seonbawi	선바위	선바위				Gwacheon Line	2.0	33.1	Gyeonggi-do	Gwacheon-si
436	Seoul Racecourse Park	경마공원	競馬公園					1.0	34.1
437	Seoul Grand Park (Seoul Land)	대공원 (서울랜드)	大公園 (서울랜드)					0.9	35.0
438	Gwacheon	과천	果川					1.0	36.0
439	Government Complex Gwacheon	정부과천청사	政府果川廳舍					1.0	37.0
440	Indeogwon	인덕원	仁德院					3.0	40.0		Anyang-si
441	Pyeongchon	평촌	坪村					1.6	41.6
442	Beomgye	범계	범계					1.3	42.9
443	Geumjeong	금정	衿井				Ansan Line	2.6	45.5		Gunpo-si
444	Sanbon	산본	山本	●				2.3	47.8
445	Surisan	수리산	修理山	\|				1.1	48.9
446	Daeyami	대야미	大夜味	\|				2.6	51.5
447	Banwol	반월	半月	\|				2.0	53.5		Ansan-si
448	Sangnoksu	상록수	常綠樹	●				3.7	57.2
449	Hanyang University at Ansan	한대앞	漢大앞	\|		Suin–Bundang (shared)		1.5	58.7
450	Jungang	중앙	中央	●				1.6	60.3
451	Gojan	고잔	古棧	\|				1.4	61.7
452	Choji	초지	草芝	●				1.5	63.2
453	Ansan	안산	安山	●				1.8	65.0
454	Singiloncheon	신길온천역	新吉溫泉	\|				2.2	67.2
455	Jeongwang	정왕	正往	●				2.9	70.1		Siheung-si
456	Oido	오이도	烏耳島	●				1.4	71.5		Siheung-si

Depots, junctions, and points of interest[]

(from Danggogae to Oido)

Turnback siding (underground) after Danggogae Station
Changdong Depot (used for Seoul Metro class 4000)
Connecting track to Line 3 before Chungmuro Station
Dongjak Bridge
Chongshin Univ. – Sadang scissors crossover
Hanyang University, ERICA Campus
Turnback siding (underground) after Sadang Station
Namtaeryong–Seonbawi track crossing point (flying crossover, switch from right to left-hand traffic, or vice versa)
- The voltage/current switches between DC 1,500 V ↔ AC 25,000 V
Ansan Depot (used for simple maintenance of Korail Class 341000 train)
Siheung Depot (used for Korail Class 341000 maintenance and also for heavy maintenance of Korail Class 311000 trains operated on Line 1)
The largest scale of shell mounds in the South Korean west coast in Oido

Rolling stock[]

Current[]

Seoul Metro[]

Seoul Metro 4000 series
- 1st generation, DC only: 4-01~4-26 (only allowed between Danggogae & Sadang)
- 1st generation, DC & AC: 4-51~4-71
- 2nd generation: 4-81~4-85
  - Not yet in service.

Korail[]

Korail Class 341000 (ex-Korail Class 2030)
- 1st generation: 341-01~341-25
- 2nd generation: 341-26~341-30
- 3rd generation: 341-31~341-37
  - Trains 341-31~341-34 are temporary running on Line 1.