Abstract: The disclosure relates to monitoring a state of a physical passenger transport system. A method comprises monitoring the state of the passenger transport system using an updated digital-double dataset (UDDD) that reproduces in a machine-processable manner characterizing properties of components of the physical passenger transport system in an actual configuration after its assembly and installation. At least one detection device is arranged in the conveyor belt of the physical passenger transport system that detects accelerations and changes in position in all three axes during operation, which are transmitted to the virtual conveyor belt of the UDDD. Using dynamic simulations, forces, impulses and vibrations resulting from the dynamic behavior of the conveyor belt, which act on the virtual components of the virtual conveyor belt, corresponding to the physical components, and on the virtual components which interact with the virtual conveyor belt, can be determined and evaluated.