High-speed railroad of South Korea connects all the largest cities of the country: Seoul, Busan, Daegu, Gwangju, Daejeon and Incheon. The main railway line is the Gyeongbu Line which connects Seoul with Busan. The next popular route in South Korea is Daejeon - Mokpo, which belongs to Honam Line. There is also a separate line which connects Seoul and Incheon Airport - AREX (Incheon Int'l Airport Line). Here is the list of the most popular railway routes in South Korea:
Check out other Korean trains routes.