The Tokyo Waterfront Railway (東京臨海高速鉄道 Tokyo Rinkai Kosoku Tetsudo, or Rinkai Line) is a private railway in Tokyo, Japan, connecting Tokyo to the artificial islands of Aomi and Odaiba in Tokyo Bay. It is served by some trains on the JRSaikyo Line, which continue from Osaki to Shinjuku, Ikebukuro, and Omiya.
The line opened for service on March 30, 1996 from Kiba to the Teleport, and was extended to Osaki on December 1, 2002. While usually not considered an official part of the Tokyo subway network, the line runs underground for most of the distance.
Tokyo as an administrative region, known as Tōkyō-to 東京都 or "Tokyo Metropolis", is one of 47 prefectures of Japan and is not administered as a single city.
Tokyo was already the nation's political, economic, and cultural center, and the emperor's residence made it a de facto imperial capital as well with the former Edo Castle becoming the Imperial Palace.
The city of Tokyo was established, and continued to be the capital until it was abolished as a municipality in 1943 and merged with the "Metropolitan Prefecture" of Tokyo.
The Tokyo Metropolitan Government is now looking into extending and improving the urban expressways separated from ordinary roads and streets, taking into account the need to ensure harmony with environment along the roads, in order to maintain urban functions and to cope with the increasing demands of road traffic.
In Tokyo where the density of traffic is high and the use of land is exhaustive, it is necessary to enhance public transportation services and promote their use by improving the networks of routes.
For this reason, it is necessary to enhance the convenience of railways and alleviate the congestion of trains with commuters and reducing the time of transit by railways by expanding and improving the railway network.