I understand that the KTX line is being extended to ICN airport. I am not sure if this has happened yet, or when it is going to start. I have seen press releases from Korail which talk about "Spring 2014" and another said "April 2014". I saw a blog which mentioned that they were starting in June 2014.
Does anyone know if this has started yet? Or if not when it will start?
Also, when it does start, what would be the best way to book?