1. 1) Railway Technical Research Institute (RTRI), URL Home page, http://www.rtri.or.jp.
2. 2) The Survey on Transport Energy, 1999 (Information and Research Department, Transport Policy Bureau, Ministry of Transport, in Japanese).
3. 3) H. Fujimoto: “Superconducting technology; Application to electric railways,” 2001 National Convention Record, The Institute of Electrical Engineers of Japan (IEEJ), (3.2001), S18-6, 2001 (in Japanese).
4. 4) H. Nakashima: “Application of superconducting technology to conventional railways,” The 12th Lecture Conference of Railway Technical Research Institute (12.1999) pp. 54-61, 1999 (in Japanese).
5. 5) H. Fujimoto et al.: “Superconducting and mechanical properties of Sm-Ba-Cu-O bulk superconductors,” presented at ISS 2003, Tsukuba, Japan, Oct. 27-29, 2003.