Railriding consists of using a two, three, or four wheeled light weight vehicle that's powered by pedal or motor, and riding it on railroad tracks. There are many different designs, many different guide systems and outriggers. This very safe sport is done all over the world.
http://www.railriders.net/whyrailriding.html
Transmisions
http://en.wikipedia.org/wiki/Hydristor
Flywheels
http://www.magnet-motor.de/produktemds_e.htm
Windup
http://windupradio.com/trevor.htm
Sailing
http://en.wikipedia.org/wiki/Leeway
http://en.wikipedia.org/wiki/Land_sailing
http://en.wikipedia.org/wiki/Land_yacht
http://en.wikipedia.org/wiki/Ice_yachting
http://en.wikipedia.org/wiki/Ice_boat
http://www.bfslyc.org.uk/pages/fed_show_photo.aspx.....
http://www.macquarie.com.au/speedsailing/gallery.htm
windmills
http://nov55.com/wdm.html
other
http://www.solarsailor.com.au/
http://www.sail.nl/english/news/ns-introduces-sailing-train-during-sail-2005/