Kokubu Station is a passenger railway station located in the city of Takamatsu, Kagawa Prefecture, Japan. It is operated by JR Shikoku and has the station number "Y04".

The Marine Liner is a rapid train service in Japan operated by West Japan Railway Company and Shikoku Railway Company since April 1988. The Marine Liner links Okayama, the capital city of Okayama Prefecture and a major station on the Sanyō Shinkansen, with Takamatsu, the capital city of Kagawa Prefecture on the island of Shikoku, via the Great Seto Bridge. Operating at a top speed of 130 km/h, the journey takes approximately 52–63 minutes.