There were plans to extend the line beyond Sugimotocho, to construct a track yard (railway) at Kitajima and to construct a freight & passenger line from Suminoe to Osakako and Ohama in Sakai City (including a plan to convert the Hanwa Freight line into a freight & passenger line), but none of them materialized because of financial difficulties of JNR.
一時は杉本町から先の延伸計画もあり、北島に操車場(鉄道)、さらに住之江から大阪港と堺市大浜への貨客線の建設計画（阪和貨物線の旅客線化を含む）もあったが、国鉄の財政難のため実現しなかった。