Japan
- Railway Technical Research Institute: http://www.rtri.or.jp/eng/index.html
- East Japan Railway Company: http://www.jreast.co.jp/e/
United States
- TIG/m: http://www.tig-m.com/ Hydrogen in Off-Wire Streetcar Operation
- Fuel Cell Propulsion Institute: http://www.fuelcellpropulsion.org/
- Vehicle Projects LLC: http://www.vehicleprojects.com/
- Research and Innovative Technology Administration, U.S. Department of Transportation: http://www.rita.dot.gov/
Italy
- ENEA: Italian National agency for new technologies, Energy and sustainable economic development: http://old.enea.it/com/ingl/default.html
United Kingdom
- Rail Safety and Standards Board (RSSB): http://www.rssb.co.uk/Pages/Main.aspx
Denmark
- The Hydrogen Train: http://www.hydrogentrain.dk/