How a staircase folds into a level landing
An escalator step has to do two jobs: stay level while carrying a rider on the incline, then become part of a flat surface at either end. It manages this through rollers beneath each step that follow shaped guide tracks. As the tracks rise, they keep the steps level; near the landing, their path curves so the steps move together into a flat run beneath the floor plates.
A linked chain pulls the steps around this continuous loop. The visible wooden tread is mounted on a metal structure, so the wood provides the surface underfoot while the frame and running gear do the demanding mechanical work. At the top and bottom, the moving steps pass through comb-like plates whose teeth fit into the grooves between them, helping riders step on and off without a large open gap.
Old surfaces, working machinery
That division between the familiar-looking tread and the machinery beneath it helps explain how an escalator can retain wooden steps while still functioning as modern transport. The steps must travel in a precise sequence: a roller leaving its track too early, or a step arriving out of alignment, would disrupt the transition riders depend on.
The result is more than an antique-looking staircase. At Macy’s Herald Square, shoppers encounter an operating piece of early escalator design: wood where people walk, steel and carefully guided motion underneath. The striking part is that the steps do not simply climb and descend; the track system reshapes their path so a moving staircase can briefly become a level floor.
