上越線・吾妻線で211系の営業運転開始 [211 series enter service on Joetsu Line and Agatsuma Line]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 24 August 2016. Retrieved 27 August 2016.
吾妻線新線で試運転 [Test-running starts on new Agatsuma Line section]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 29 September 2014. Retrieved 1 October 2014.