Incidentally, when the Series 5300 wasn't equipped with an electric rollsign the train of this series would carry a plate comprised of three illuminable spaces on both sides of the body, where a rollsign is currently placed, and when the train (Sakaisuji-Junkyu) was operated the words Sakaisuji and Express were illuminated on the two of the three spaces with an unlit space in between, such as '堺筋　急行.'
蛇足ながら、5300系の電動式表示幕が非装備だった時代は、車体側面の現在表示幕となっている部分には「堺筋　急行」と、表示可能な3か所のうち2か所を点灯させて表示していた。