Heiwajima (later renamed Ryutsu Center) in 1969, Showajima in 1985, and Tennozu Isle in 1992.

By the 2000s, the cumulative addition of stations had extended travel time between Hamamatsucho and Haneda to nearly 25 minutes. In response, Showajima was rebuilt in 2007 as a four-track station with a passing loop, allowing express services to overtake local trains and