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...

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...

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...