3編成18両の車両増強と南流山駅ホーム改良計画について [Details of new build of 3 trainsets and platform improvements at Minami-Nagareyama Station] (PDF). Tsukuba Express News Release (in Japanese). Metropolitan Intercity Railway Company. 11 January 2011. Archived from the original(PDF) on 6 March 2012. Retrieved 12 January 2011.
"3 編成18 両(TX-2000 系車両)を導入します。" [Three TX-2000 series sets (18 vehicles) to be introduced] (PDF). Tsukuba Express News Release (in Japanese). Metropolitan Intercity Railway Company. 18 June 2012. Retrieved 20 June 2012.[permanent dead link]
railf.jp
TX-2000系にロングシート改造車が登場 [TX-2000 series modified with longitudinal seating]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 28 April 2017. Archived from the original on 29 April 2017. Retrieved 29 April 2017.
web.archive.org
3編成18両の車両増強と南流山駅ホーム改良計画について [Details of new build of 3 trainsets and platform improvements at Minami-Nagareyama Station] (PDF). Tsukuba Express News Release (in Japanese). Metropolitan Intercity Railway Company. 11 January 2011. Archived from the original(PDF) on 6 March 2012. Retrieved 12 January 2011.
TX-2000系にロングシート改造車が登場 [TX-2000 series modified with longitudinal seating]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 28 April 2017. Archived from the original on 29 April 2017. Retrieved 29 April 2017.