1) East Japan Railway Company 
Nihonkai (日本海) commonly refers to: ...[train] The `Sea of Japan` is a seasonal overnight train which is operated by the East Japan Railway Company (JR East). The train runs overnight between Osaka Station and Aomori Station using the Tōkaidō Main Line, Kosei Line, Hokuriku Main Line, Shinetsu Main Line, Uetsu Main Line, and Ōu Main Line. From the start of the March 17, 2012 ...