Did Prague to Brussels in one day (~ 12 hours) in 2010 and everything just worked. One connection in Frankfurt airport (it has a train station) and it was cheap

Did Prague to Brussels in one day (~ 12 hours) in 2010 and everything just worked. One connection in Frankfurt airport (it has a train station) and it was cheaper than flying. Will need to check how I bought the ticket but do know it was bought as a single ticket. Good thing I left early in the morning because the later trains to Germany all got stuck in heavy snow downfalls. \o/