Elevator system with simplified power supply for shaft door assemblies

An elevator system comprising:

• a shaft opening at each floor of a plurality of floors of a building having a shaft door assembly, each of the shaft door assemblies being operable to open and close the shaft opening;
• a rail system having a guide rail that extends along the plurality of floors and is adapted for guiding a vertically movable component of the elevator system, the guide rail being electrically conductive, and a bracket adjacent to each of the floors anchoring the guide rail to a wall of the building, the brackets being electrically conductive;
• wherein the guide rail is electrically conductively connected to each of the brackets;
• wherein each of shaft door assemblies has a shaft door device being a drive device and/or a control device for operating the shaft door assembly;
• wherein each of the shaft door devices is supplied with electrical energy via two electrically conductive paths;
• and
• wherein a first of the electrically conductive paths is formed over at least parts of the rail system.