as reflected in the recent name change from ultra high-speed rail to magnetic levitation rail , not only is high speed sought , but importance is placed on the low noise and ease of maintenance characteristics of a noncontact railway , which has a drive method that does not depend on adhesion , and on energy conservation by using lighter weight cars , which is a feature of a primary ground system -lrb- driving and controlling the car is mainly performed by ground facilities -rrb- .