When the directional signboard was used, it was a round-shaped board with a white background on which "Sub-express (準急）" was written in blue (the destination was written in black letters) (the trains that arrived at and departed from Tenmabashi Station used the yellow background board with blue letters that read "Sub-express（準急）").
また、方向板を使用していたときは、丸板で白地に青文字で準急（行き先は黒字）と書かれたものを使っていた（天満橋発着列車は黄色地に青文字で準急）。