Maglev train: Wheels are not needed as they float on magnetically supported rail tracks. Bullet train: Bullet trains (except Maglevs) run on wheels. There are a few countries using powerful electromagnets to develop high-speed trains, called maglev trains. These trains float over guideways using the basic principles of magnets to replace the old steel wheel and track trains. There’s no rail friction to speak of, meaning these trains can hit speeds of hundreds of miles per hour.