It is considered that the change of color was made in order to enhance the sense of unity with the Chuo Line upon the establishment of the name 'Yumehanna' by using a color similar to the line color used by the Chuo Line, but it is also considered that, since the line color of the Osaka Municipal Subway Imazatosuji Line has become orange, the color change was made to prevent the Keihanna Line from being mistaken for this subway line.
これは前述の「ゆめはんな」の愛称制定により中央線のラインカラーと同系の色に合わせて一体感を図るためと思われるほか、大阪市営地下鉄今里筋線のラインカラーがオレンジ（柑子色）となったことから、同線との混同が起こることを避けるためとも思われる。