Korea generally run on the left side. Rapid (Express) trains Korail operates a variety of express "rapid" (Korean: 급행 geup-haeng, Hanja: 急行) trains for long distance commuter services on Line 1. These services include: Gyeongin line express services from Yongsan to Dongincheon, operating express between Guro and Dongincheon, including: Regular express services, introduced on January 29, 1999, following quadruple-tracking of the Gyeongin Line. Faster limited express (Korean: 특급 teuk-geup) trains, introduced on July 7, 2017. Gyeongbu line express services from Cheongnyangni to Cheonan or Sinchang, operating express between Gasan Digital Complex and Cheonan and running local elsewhere. Green Gyeongbu line express service from Seoul Station to Cheonan or Sinchang, originating at a platform adjacent to Seoul Station, skipping all stations between Seoul Station and Geumcheon-gu Office Station, making intermediate stops at Anyang, Gunpo, Uiwang, and Sungkyunkwan University, and then following the red Gyeongbu line express service pattern south of Suwon. Northbound services (departing from Cheonan/Sinchang and terminating at Seoul Station) stop at Yeongdeungpo station, but southbound services are unable to due to the lack of a raised platform. This service was introduced on September 25, 1982. Gyeongwon line express services from Dongducheon (although several trains originate from Soyosan) to Incheon, operating express between Dongducheon and Kwangwoon University and running local between Incheon and Kwangwoon University. Former express services include: One late night Gyeongin line express service that originated at Soyosan, made all stops to Guro, then made express stops until Incheon. Yeongdeungpo-Byeongjeom Gyeongbu line express service, skipping all stations between Yeongdeungpo and Anyang and then following the Yeongsan-Cheonan/Sinchang express service pattern south of Anyang until Byeongjeom. This service was introduced on August 25, 2014 and was discontinued on December 9, 2016. Two faster Yongsan-Sinchang limited express trains (one in each direction), introduced in 2013. This train only operated on weekends and holidays. It was discontinued on July 1, 2018. Electrifcation Seoul Subway Line 1 is powered by 1500 V direct current between Cheongnyangni station and Seoul Station, and by 25000 V alternating current elsewhere. Because of this different manner of offering electric current, there are neutral sections between Cheongnyangni station and Hoegi station, as well as between Seoul Station and Namyeong station. Stations Main Lines Local lines: Soyosan, Dongducheon, Uijeongbu or Yangju — Incheon Uijeongbu (3 times only on weekdays), Kwangwoon Univ. or Cheongnyangni — Cheonan, Sinchang, or Seodongtan Yeongdeungpo — Gwangmyeong (shuttle) Express lines: GW: Gyeongwon Express (Soyosan or