Slipstream Runners are very large, smooth, rails that are used to help ride the quantum strings which make up the Slipstream. They are not completely essential for using slipstream as FTL travel, but they do make precision steering easier and make the ride a whole lot smoother. Smaller ships, such as Drones, Slipfighters, and cargo vessels like the Eureka Maru cannot be designed with slipstream runners because the ship needs to be a certain size in order to be effective. Extremely large vessels, such as the Magog Satellite Ship and Magog World Ship, have no need for runners to provide stability and speed, as their colossal mass of trillions of tons anchor them in the slipstream, and make them extremely stable.