Seoul Subway Line 4

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 (Jinjeop) is in Jinjeop-eup, Namyangju-si, Gyeonggi-do. In 2019, the Seoul Metro operated section had an annual ridership of 327 million or about 895,000 passengers per day.[4]

Line 4
Seoul Metro 4000 series EMU in January 2007
(up)
Korail Class 341000 series EMU in January 2021
(down)
Overview
Native name4호선（四號線）
Sa Hoseon
StatusOperational
TerminiJinjeop
Oido
Stations48
26-Seoul Metro
22-Korail
Service
TypeRapid transit
SystemSeoul Metropolitan Subway
Operator(s)Seoul Metro & Korail
History
Opened20 April 1985 (1985-04-20)
Technical
Line length72.1 km (44.8 mi)
31.7 km (19.7 mi) Seoul Metro[1]
40.4 km (25.1 mi) Korail[2]
Number of tracks2
Electrification1,500 V DC (Jinjeop to Namtaeryeong)
25 kV AC at 60 Hz (Seonbawi to Oido)

Northbound trains that run on the Ansan and Gwacheon Lines terminate at Danggogae, except during night time where they short-turn at various stations. Southbound trains that run on the Ansan and Gwacheon Lines terminate at Oido or Ansan. All trains from Jinjeop short-turn at Sadang, though some short-turn trains to Sadang start at Danggogae or terminate one station south at Namtaeryeong.

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.

2022:

March 19: The line is extended northward from Danggogae to Jinjeop.[5]

Future

Express services are planned to start skipping various stations north of Sanbon station by 2023 to cut travel times.[6]

Stations
Station
Number
Station Name
English
Station Name
Hangul
Station Name
Hanja
EX
Transfer
Line Name
Distance
in km
Total
Distance
Location
405
 Jinjeop 진접榛接 Makes all stops
Jinjeop Line
---
0.0
Gyeonggi-do
Namyangju-si
406
 Onam 오남梧南
2.1
2.1
407
 Pungyang (TBD) 풍양豊壤
2.6
4.7
408
 ByeollaeByeolgaram 별내별가람別內別가람
5.2
9.9
409
 Danggogae 당고개당고개
Seoul Metro Line 4
4.4
14.3
Seoul
Nowon-gu
410
 Sanggye 상계上溪
1.2
15.5
411
 Nowon 노원蘆原
1.0
16.5
412
 Chang-dong 창동倉洞
1.4
17.9
Dobong-gu
413
 Ssangmun 쌍문雙門
1.3
19.2
414
 Suyu
(Gangbuk-gu Office)		 수유
(강북구청)		水踰
(江北區廳)
1.5
20.7
Gangbuk-gu
415
 Mia
(Seoul Cyber University)		 미아
(서울사이버대학)		彌阿
(서울사이버大學)
1.4
22.1
416
 Miasageori 미아사거리彌阿사거리
1.5
23.6
417
 Gireum 길음吉音
1.3
24.9
Seongbuk-gu
418
 Sungshin Women's University
(Donam)		 성신여대입구
(돈암)		誠信女大入口
(敦岩)
1.4
26.3
419
 Hansung University
(Samseongyo)		 한성대입구
(삼선교)		漢城大入口
(三仙橋)
1.0
27.3
420
 Hyehwa
(Seoul Nat’l Univ. Hospital)		 혜화
(서울대학교병원)		惠化
0.9
28.2
Jongno-gu
421
 Dongdaemun 동대문東大門
1.5
29.7
422
 Dongdaemun History & Culture Park 동대문역사문화공원東大門歷史文化公園
0.7
30.4
Jung-gu
423
 Chungmuro 충무로忠武路
1.3
31.7
424
 Myeongdong
(Jeonghwa Arts College)		 명동
(정화예술대)		明洞
0.7
32.4
425
 Hoehyeon
(Namdaemun Market)		 회현
(남대문시장)		會賢
(南大門市場)
0.7
33.1
426
 Seoul Station 서울역서울驛
(Seoul Station branch)
Mugunghwa-ho and ITX-Saemaeul services
0.9
34.0
Yongsan-gu
427
 Sookmyung Women's University
(Garwol)		 숙대입구
(갈월)		淑大入口
(葛月)
1.0
35.0
428
 Samgakji 삼각지三角地
1.2
36.2
429
 Sinyongsan 신용산新龍山
0.7
36.9
430
 Ichon
(National Museum of Korea)		 이촌
(국립중앙박물관)		二村
(國立中央博物館)
1.3
38.2
431
 Dongjak
(Seoul National Cemetery)		 동작
(현충원)		銅雀
(顯忠院)
2.7
40.9
Dongjak-gu
432
 Chongshin University
(Isu)		 총신대입구
(이수)		總神大入口
(梨水)
1.8
42.7
433
 Sadang
(Daehang Hospital)		 사당
(대항병원)		舍堂
1.1
43.8
434
 Namtaeryeong 남태령南泰嶺
1.6
45.4
Seocho-gu
435
 Seonbawi 선바위선바위
Gwacheon Line
2.0
47.4
Gyeonggi-do
Gwacheon-si
436
 Seoul Racecourse Park 경마공원競馬公園
1.0
48.4
437
 Seoul Grand Park
(Seoul Land)		 대공원
(서울랜드)		大公園
(서울랜드)
0.9
49.3
438
 Gwacheon 과천果川
1.0
50.3
439
 Government Complex Gwacheon 정부과천청사政府果川廳舍
1.0
51.3
440
 Indeogwon 인덕원仁德院
3.0
54.3
Anyang-si
441
 Pyeongchon 평촌坪村
1.6
55.9
442
 Beomgye 범계범계
1.3
57.2
443
 Geumjeong 금정衿井
Ansan Line
2.6
59.8
Gunpo-si
444
 Sanbon 산본山本
●
2.3
62.1
445
 Surisan 수리산修理山
|
1.1
63.2
446
 Daeyami 대야미大夜味
|
2.6
65.8
447
 Banwol 반월半月
|
2.0
67.8
Ansan-si
448
 Sangnoksu 상록수常綠樹
●
3.7
71.5
449
 Hanyang University at Ansan 한대앞漢大앞
|
 Suin–Bundang
(shared)
1.5
73.0
450
 Jungang 중앙中央
●
1.6
74.6
451
 Gojan 고잔古棧
|
1.4
76.0
452
 Choji 초지草芝
●
1.5
77.5
453
 Ansan 안산安山
●
1.8
79.3
454
 Neunggil 능길陵길
|
2.2
81.5
455
 Jeongwang 정왕正往
●
2.9
84.4
Siheung-si
456
 Oido 오이도烏耳島
●
1.4
85.8

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

Seoul Metro
  • Seoul Metro 4000 series
    • 1st generation, DC only: 4-01~4-26 (only allowed between Jinjeop & Sadang)
    • 1st generation, DC & AC: 4-51~4-71
    • 2nd generation: 4-81~4-85

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.
  • Seoul Metro 4000 series EMU (1st generation)
  • Korail Class 341000 (1st generation)
  • Korail Class 341000 (2nd generation)
  • Korail Class 341000 (3rd generation)

Seoul Metro
  • Seoul Metro wide-width GEC chopper resistor controlled electric car (1985–1993; transferred to Seoul Subway Line 3)

Korail
  • Seoul Metro 3000 series GEC (Former 4000 series GEC), June 2013
  • Korail Class 1000 (2nd batch)

See also

References
  1. 지하철건설현황 [Status of Subway Construction] (in Korean). Seoul City Government. Retrieved 22 February 2014.
  2. "Metro Lines & Trains in Operation". Korail. Retrieved 25 July 2014.
  3. "서울교통공사 블로그 : 네이버 블로그". blog.naver.com. Retrieved 31 May 2021.
  4. "서울시 지하철수송 통계". data.seoul.go.kr (in Korean). Retrieved 21 May 2021.
  5. "EzPDF WebViewer".
  6. "4호선 금정~사당 급행열차 추진된다". 중부일보 - 경기·인천의 든든한 친구. 11 July 2017.
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