French Compound Locomotives
- Information on the work of the man internationally called "The genius of steam", French engineer Andre Chapelon, designer of the most efficient steam locomotives ever built. Includes pictures and technical drawings.
- http://www.chapelon.net/

The Ultimate Steam Page
- Recent steam locomotive developments and information on continuing efforts to produce the Ultimate Steam Locomotive. Such are still used in remote locations around the world, and serious attempts have been made to return them to general use.
- http://www.trainweb.org/tusp/index.html