The , or JRTT, is an Independent Administrative Institution

Independent Administrative Institution

An Incorporated Administrative Agency or in lay terms an Independent Administrative Corporation or Independent Administrative Institution is a newly designed type of legal body for Japanese governmental organizations regulated by the Basic Law on Reforming Government Ministries of 1998...

 created by an act of the Diet of Japan

Diet of Japan

The is Japan's bicameral legislature. It is composed of a lower house, called the House of Representatives, and an upper house, called the House of Councillors. Both houses of the Diet are directly elected under a parallel voting system. In addition to passing laws, the Diet is formally...

 effective October 1, 2003. JRTT was founded by integrating the Japan Railway Construction Public Corporation

Japan Railway Construction Public Corporation

was a public corporation responsible for the construction of railway lines in Japan.The JRCC was established in 1964 as the successor to JNR's railway line construction division. Kakuei Tanaka, then an influential member of the House of Representatives, was said to have been involved in its creation...

 (JRCC) and the Corporation for Advanced Transport and Technology (CATT).

JRTT was a major shareholder in the West Japan Railway Company

West Japan Railway Company

, also referred to as , is one of the Japan Railways Group companies and operates in western Honshū. It has its headquarters in Kita-ku, Osaka.-History:...

 and Central Japan Railway Company

Central Japan Railway Company

The is the main railway company operating in the Chūbu region of central Japan. It is officially abbreviated in English as JR Central and in Japanese as . Its headquarters are located in the JR Central Towers in Nakamura-ku, Nagoya, Aichi Prefecture.The company's operational hub is Nagoya Station...

before offering those shares to the public in 2004 and 2005 respectively.