Tsukuba Express, which was then provisionally called the Jōban New Line (常磐新線, Jōban Shinsen). The new line was planned to relieve crowding on the Jōban...

Retrieved 20 May 2022 – via railf-library.jp. (subscription required) "常磐緩行線(東京メトロ千代田線直通)に新型電車を導入" [Introduced a new train on the Joban Line (directly...

Narita Line to Narita via Abiko and are referred to as Jōban・Narita Line (常磐・成田線) trains. Rapid trains will skip some stations between Kita-Senju and Abiko...