France's new "aero-train" sets a world record for trains, hitting 233 mph. It rides on a cushion of air while straddling a concrete track and will be in operation by the mid-70's. An experimental monorail train is shown with a collection of jet engines mounted on its' rear. It construction is sleek and streamlined. A close-up is made of one of its' engines. Onlookers watch as the train goes by them. It moves at 200 miles per hour.