This color is also used for the special cars for the Imperial Family (with the exception of cars selected as ad-wrapped cars), and the interior is also finished in a uniform manner with panel boards in a woodtone finish and the seats covered with angora (goat) fabric dyed in colors listed in the Shikimei Ichiran (the standardized color list used in Japan) that begin with the Japanese letter "こ" (pronounced "ko").
お召し列車でも用いられる色）が採用されている（ラッピング車両に抜擢された場合を除く）ほか、内装についても木目調の化粧板や色名一覧(こ)色のアンゴラ(ヤギ)の毛のシートを採用するなど統一されている。