"上高地線 ２０年ぶり新車両 都内の地下鉄走った「２００００系」 来春から運行" [New rolling stock to be introduced to the Kamikochi line after 20 years - 20000 series from the Tobu Railway to commence operations starting from spring.]. shinmai.co.jp (in Japanese). The Shinano Mainichi Shimbun. 22 June 2021. Archived from the original on 22 June 2021. Retrieved 22 June 2021.
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"上高地線 ２０年ぶり新車両 都内の地下鉄走った「２００００系」 来春から運行" [New rolling stock to be introduced to the Kamikochi line after 20 years - 20000 series from the Tobu Railway to commence operations starting from spring.]. shinmai.co.jp (in Japanese). The Shinano Mainichi Shimbun. 22 June 2021. Archived from the original on 22 June 2021. Retrieved 22 June 2021.
