Abstract: An elevator system with a carriage for moving a payload such as personnel or cargo traversely along a vertically lofty silo or other vertically elongated structural environment, the elevator system comprising a finite-length framework along which the vertically movable carriage through a guidable yoke slidably traverses and including at least one upright lugged-rail having laterally projecting horizontal lugs spaced at liberal-increments-intervals therealong. Confined to the carriage and wholly co-movable therewith is a crawling-propulsion assembly which includes a vertically elongated short-length tightenable annular-belt having regularly-spaced openings for removably securely engaging successive lug projections whereby the annular-belt linear leadward frontal-length suspendably supports and crawlably propels the loadable carriage along the framework upright lugged-rail.