Superconductors were well known to physicists and chemists in the early 1900's and were one of the last great scientific discoveries achieved.  Starting in 1923, Emile Bachelet, an electrician, built a magnetic track that was able to suspend a train in the air using the forces of magnetic attraction and repulsion.  This levitation trait was also utilized in 1934 when a man named  Hermann Kemper designed a monorail vehicle for transportation that did not require wheels just a magnetic field that would propell the train further down the track. Through much rigorous research this technology was eventually implemented for public use in 1991 when Germany's government certified operation of the first maglev(magnetic Levitation) train.