 Two separate trains, designed by Disney Imagineer Bob Gurr, and built as scale replicas of General Motors' futuristic "Aerotrain", traveled along a dog-bone track circuit (rail line with a turnaround loop at each end) through parts of Tomorrowland and Fantasyland.The Tomorrowland train featured cars that were named for the planets, while the cars of the Fantasyland train were named after various Disney characters.The modern, streamlined trains were placed into service to represent the future of rail travel, in contrast to the steam-powered DRR which represented its past.