Niwasaka Station
Lines. Niwasaka Station is served by the Ōu Main Line (Yamagata Line), and is located 6.9 km from the terminus of the line at . Station layout. Niwasaka Station has a single island platform and a single side platform connected to the station building by a footbridge. The station is unattended. History. Niwasaka Station opened on 15 May 1899. The station was absorbed into the JR East network upon the privatization of JNR on 1 April 1987. The current station building dates from March 2003.