Furthermore, this places some areas of Chiba Prefecture out of the 1-hour commute zone from Central Tokyo, reducing land value, and causing further reason for a decease in population.

Some have theorised that this is a strategy by the Tokyo government to centralise the population around the city's core, discouraging long distance commutes.

[13] Passenger service began on 3 March 1986 between Minami-Funabashi and Chibaminato, and was extended east to Soga and west to Shin-Kiba on 1 December 1988.

Rinkai Line reused the partially completed tunnel from Shin-Kiba to Tokyo Freight Terminal, with portion of tracks within the latter serving as a depot.

[19] However, following requests from local and prefectural governments, two westbound rapid services to Tokyo Station in the morning rush were reinstated by JR East for the upcoming schedule revision.

[20] There is also a concept of introducing 12-car trains with Green Car capacities, much like the current status of the Chuo Line running from Tokyo to Takao, although it is viewed as unlikely due to the cost of platform expansion.