Ōi Keibajō Mae became the monorail's first infill station upon its completion in May 1965. It was originally built as a temporary station above the water along the coast and only operated on days when an event was taking place at Ohi Racecourse. Its permanent replacement opened two years later. The city government subsequently reclaimed the area around this station and developed a housing complex known as . In November 1967, an overpass connecting the monorail platform to the JR platforms of Hamamatsuchō Station was completed. Between 1967 and 1993, four more stations were built along the original alignment; these were Haneda Seibijō, later renamed Seibijō (1967); Shin Heiwajima, later renamed Ryūtsū Center (1969); Shōwajima (1985); and Tennōzu Isle (1992).
