This is the Salto Mortale Ride Kit (9 7/8" x 9 7/16" x 6 11/16'') HO Scale Model Railroad Building by Faller.
Around and around they go - high into the sky then down towards the ground. Windmill-like blades spin riders in a somersaulting motion on this breathtaking ride. It's fitted with two motors, one to operate the ride and one to control lighting and is ready to operate on 16V AC. The easy-to-build kit features prototypically colored plastic parts, great details and fully illustrated step-by-step instructions.