- Native name
- 수도권 전철
- Owner
- Government of South Korea , Seoul Metropolitan Government , Incheon Metropolitan City , Bucheon City , Uijeongbu City , Yongin City
- Locale
- Seoul Metropolitan Area
- Transit type
- Rapid transit , Commuter rail
- Annual ridership
- 2.42 billion (2024, Lines 1-8, Seoul Subway) , 1.16 billion (2017, Korail)
- Began operation
- 15 August 1974 ; 51 years ago ( 1974-08-15 )
- Operator s
- Seoul Metro , Korail , Incheon Transit Corporation , and private rapid transit operators
- System length
- 1,302.2 km (809.1 mi) (all lines)
- Track gauge
- 1,435 mm ( 4 ft 8 + 1 ⁄ 2 in ) standard gauge , 1620 mm , 1700 mm