Saku-Uminokuchi Station
Lines. Saku-Uminokuchi Station is served by the Koumi Line and is 39.7 kilometers from the terminus of the line at Kobuchizawa Station. Station layout. The station consists of two opposed ground-level side platforms serving two tracks, connected to the wooden station building by a level crossing. The station is unattended. History. Saku-Uminokuchi Station opened on 27 December 1932. With the privatization of Japanese National Railways (JNR) on 1 April 1987, the station came under the control of JR East. The current station building was completed in 2012.