1. 1) The survey on transport energy, Ministry of transport, 1999.
2. 2) http://www.hitachi.co.jp/pe/memlist/kojin/php/andou/index.html
3. 3) Watanabe, T.: Trend of Railway Technologies and Power Semiconductor Devices, ISPSD'99, pp.11-18, 1999.
4. 4) Final Drafts of International Standard : IEC 62236: Railway applications -Electromagnetic compatibility- Part 1- Part 5, 2003.
5. 5) IEC 62278: Railway applications - Specification and demonstration of reliability, availability, maintainability and safety (RAMS), 2002.