Cut out bell cookies; trim ringer and top bolt off cookie. Bake and cool.
Place cookies on cooling grid positioned over cookie sheet. Thin down royal icing with 1 tablespoon of corn syrup and enough water for icing to reach a pouring consistency. Cover cookies with icing; let dry.
Pipe rails of roller coaster and main vertical structural beams with tip 55. Pipe cross braces with tip 2. Overpipe main rails with tip 55. Pipe-in roller coaster cars with tip 57. Pipe tip 3 bodies and arms on children; add tip 3 ball heads. Pipe tip 1 dot eyes, swirl hair, outline mouth and finger tips. Pipe tip 2 number on cars.