The TWR 70-000 series electric multiple unit (EMU) trains are based at Yashio Depot, which is accessed via a spur located between Tennōzu Isle Station and Tokyo Teleport Station (the spur track also provides access to Tokyo Freight Terminal), while the E233 series trains are based at Kawagoe Depot.

By comparison, the competing elevated Yurikamome line is profitable, thanks to lower construction expenses, higher ticket prices and popularity among tourists and leisure visitors for its scenic views.

[11] Tokyo Waterfront Area Rapid Transit, Inc. (東京臨海高速鉄道株式会社, Tōkyō Rinkai Kōsoku Tetsudō Kabushiki-gaisha) was founded on March 12, 1991, for the express purpose of constructing and operating the railway line.

[13] In spite of its severe financial situation, TWR was discovered to have made a five million yen donation to the Tokyo Metropolitan Government on October 16, 2009, to encourage the city's bid for the 2016 Olympic Games.

[14] The company stood to benefit financially if the games were held in Tokyo, as several of the proposed venues were located along the Rinkai Line.

In addition to its ownership and operation of the Rinkai Line, TWR is also involved in real estate and subcontracting/management of station- and building-related design.