Louis Brennan and his single track gyro scope train

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