Generally speaking, when the escalator rises, the rubber handrails on both sides are moving. This design is to prevent passengers from falling when leaning or holding hands. Based on this design purpose, the moving speed (linear speed) of the handrail should be as consistent as possible with the moving speed of the elevator, so as to achieve the goal of zero relative speed between them and provide stable and synchronous movement.

Choose the elevator as the frame of reference, and the handrails will not move. The ground is selected as the frame of reference, and the two move synchronously.