Abstract: This invention describes the design of a carrier system for people or goods permitting the continuous path of travel of a duo spiral escalator ascending and descending around a tower with a fixed diameter from the top to the bottom. At the bottom level and at the top level of the duo spiral escalator the invention consists of discontinuous upper and lower tracks for reversing the tread direction. Escalator chains connected to the tread support rods insure a smooth transfer of the treads between sets of tracks. This invention permits continuous transportation of the riders ascending and descending to a plurality of floors of varying ceiling heights. Current straight and spiral escalators have half of the treads carrying riders while the other half are empty as they travel back underneath. With this invention, as the treads move between floors, all of them may have riders aboard. This design saves horizontal space and requires fewer treads and materials than current escalators.