South Korea’s Jeolla line upgraded for KTX service October 31, 2011 | Asia Pacific News The 180-km Jeolla line between Iksan and Yeosu has been upgraded to operate at a speed of 180 km/hr to enable Korail to run Korea Train eXpress (KTX) services to Yeosu during the World Expo in May 201... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password