As of 1904, Flagler started what everybody considered a folly: the extension of the FEC to Key West which would later be known as the Overseas Railroad, at the time considered the eighth wonder of the world, and surely the most daring infrastructure ever built exclusively with private funds. The first train—a construction engineers' train—arrived in Key West on January 21, 1912; Flagler's special train and other passenger trains arrived the next day, January 22, 1912, and that is considered the first day of service on the new route.