an elevator has an elevator car supporting frame that can travel in a travel space provided for a journey of the elevator car supporting frame . the elevator installation is also provided with a first elevator car and a second elevator car arranged on the elevator car supporting frame . furthermore , a hydraulic moving element is arranged in a lower end region of the travel space . in this way , the first elevator car can be moved in relation to the second elevator car , by the moving device , in the lower end region of the travel space .