Quercetti Skyrail Race Marble RunReady, Set Go! Presenting the new Skyrail Race: a double track rollercoaster for spectacular marble races. The two parallel tracks, assembled using suspension wires, are designed to be used with multiple marbles, so you can race against your friends or set the balls rolling at different times. The suspension wires are not only to keep the structure stable, but also to allow you to change the elevation of the tracks and personalize the route. Skyrail