One of the more ambitious projects of the Asgard phase may be the creation of a solar-system-spanning transportation infrastructure that can best exploit solar energy for propulsion and minimize the demand for propellants. Two likely technologies may be employed for this; momentum transfer rotovator structures and magnetic mass accelerators, both of which would rely on electrodynamic tethers or plasma sail/solar particle deflection for orbital correction and momentum recovery. These large structures would be employed in large numbers in many key locations in the solar system based on the network of trajectories in the so-called Interplanetary Highway of optimal gravity-assisted trajectories and would be used to propel a series of minimalist spacecraft in form of simple capsules that use th