1. Ministry of Land, Infrastructure, Transport and Tourism, Policy Bureau. Statistical Report on Railway Transport (in Japanese).
2. Furuta R, Kawasaki Junji. Development of fuel cell hybrid railcar. The 2008 Annual Meeting I.E.E. Japan, Vol. 7, 7-S8 (5)-(8) (in Japanese), 2008.
3. Omura T, Shimada M, Nomoto H, Toyota E. Hybrid traction system for railway vehicles. The 21st Worldwide Battery, Hybrid and Fuel Cell Electric Vehicle Symposium & Exhibition (EVS21), 2005.
4. Ihara H, Kakinuma H, Sato I, Ihaba T, Anada K, Morimoto M, Oda T, Kobayashi S, Ono T, Karasawa R. Development of motor-assisted hybrid traction system. World Congress on Railway Research 2008, R2.2.3.4, 2008.
5. Ogasa M, Taguchi Y, Ohe S, Hatsukade S, Suekane H, Kadowaki S, Nakamura T. Running test results view of a contact-wire and on-board battery hybrid LRV (contact-wire-less LRV) in an existed tram line. 2008 Japan Industry Applications Society Conference, I.E.E. Japan, JIASC 2008, 3-18 (in Japanese), 2008.