Editing Agatsuma Line (section)

==Yamba Dam construction==
The construction of the [[Yamba Dam]] required the realignment of the Agatsuma line between {{STN|Iwashima|x}} and {{STN|Naganohara-Kusatsuguchi|x}}. Work on the diversion was well advanced when a change of government in 2009 resulted in the project being halted. Another change of government in 2012 revived the project. Services on the old section of the line were suspended following the last scheduled service on 24 September 2014 to allow commissioning of the new alignment.<ref name="railfan20140929">{{cite web |url=http://railf.jp/news/2014/09/29/170000.html |script-title=ja:吾妻線新線で試運転 |trans-title=Test-running starts on new Agatsuma Line section |date= 29 September 2014|work= Japan Railfan Magazine Online|publisher= Koyusha Co., Ltd.|location= Japan|language= ja|access-date= 1 October 2014}}</ref> The new alignment opened for passenger services on 1 October 2014.<ref name="railfan20140929"/> The new route is {{Convert|0.3|km|mi|abbr=on}} shorter, resulting in the shortest tunnel in Japan, the {{Convert|7|m|ft|abbr=on}} [[Tarusawa Tunnel]], being abandoned, although it is not inundated by the new dam.<ref>[https://web.archive.org/web/20170927052353/http://www.asiaone.com/asia/japan%E2%80%99s-shortest-railway-tunnel-sees-its-last-days "Japan’s shortest railway tunnel sees its last days"], ''[[AsiaOne]]'', September 19, 2014.</ref><ref>[http://www.ntv.co.jp/englishnews/society/farewell-to-japans-shortest-rail-tunnel/ "Farewell to Japan’s shortest rail tunnel"], [[Nippon TV]], September 25, 2014 (video).</ref>