首都圏新都市鉄道つくばエクスプレス
The is a third-sector railway operating company in Japan. It was established on 15 March 1991 to construct the 58.3 km Tsukuba Express (then known as the "Jōban Shinsen") commuter railway line from in Tokyo to in Ibaraki Prefecture. The Tsukuba Express line was opened on 24 August 2005.