For all the bio on the inventor, his difficulty working out how to make the train stay upright through curves, and more. Good reading. http://www.catskillarchive.com/rrextra/odgyro.Html
In 1929 he developed a working gyrocar: http://thenewcaferacersociety.blogspot.com/2008/05/when-is-motorcycle-not-motorcycle.html
