Seoul Subway Line 1 of the Seoul Metropolitan Subway is a rapid transit and commuter rail line which links central Seoul, South Korea to Yeoncheon in the northeast, Incheon in the southwest, and Sinchang via Suwon and Cheonan in the south. The central underground portion of Line 1, running underneath Sejongno, Jongno, and Wangsan-ro avenues along Seoul's traditional downtown area, is the oldest subway-operated section in the Seoul Metropolitan Subway system. Its branches and services cover a large part of the Seoul Capital Area; totaling 218.3 km (135.6 mi) in route length.
Seoul Metro 1000 series EMU in December 2017 (bottom) Korail Class 311000 series EMU in February 2021 (top)
Cheongnyangni-Hoegi DC-AC neutral section
Seoul Metro 1000 series rheostat-controlled EMU (rebuilt cars)
Seoul Metro 1000 series VVVF inverter-controlled EMU
Seoul Metropolitan Subway
The Seoul Metropolitan Subway is a metropolitan railway system consisting of 23 rapid transit, light metro, commuter rail and people mover lines located in northwest South Korea. The system serves most of the Seoul Metropolitan Area including the Incheon metropolis and satellite cities in Gyeonggi province. Some regional lines in the network stretch out beyond the Seoul Metropolitan Area to rural areas in northern Chungnam province and western Gangwon Province, that lie over 100 km (62 mi) away from the capital.
Seoul Metro 2000 series train on Line 2
T-money smart card
Magnetic-stripe ticket + Upass turnstiles on Line 4 in July 2001
The platform at Hoehyeon Station on Seoul Subway Line 4 in Jung-gu, Seoul