Nakai railways are one of large private railways in southern part of Osaka area,cnsist from two trunk lines and some branch lines.One trunk line is 'Nankai Main line'that is inter urban survices between Osaka-Namba teminal and Wakayama-shi another is 'Koya line' from Osaka-Namba terminal to Koya mountain. The line is includeig 50‰track near Koya mountain area.Until 10-1973,those lines were operated by 600V DC. Here,I intoduce many notalgy photos of old good days.After system chage to 1500V DC,all old cars were out of survices whithout Kishigawa line and some were bought by local private railways.Naw,all 600V cars cannot be seen. *Maha means moter cars standerd class. Kuha means no moter cars with cab. Saha means no motor and no cabs cars.