The Kansai Railway Company first introduced the way to identify the grades of passenger trains by painting them in various colored bands (depending on the grade) under the window (the first-class car with white, the second car with blue and an ordinary car (rail car) with red color).
客車の窓下に等級識別の帯を塗装する手法（一等車を白、二等車を青、普通車(鉄道車両)を赤）は、関西鉄道が最初に導入したものである。