Elevator system comprising: - a first shaft, in which at least one upper shuttle car and at least one lower shuttle car are arranged one above the other and are at least temporarily fixedly coupled to one another and can be moved together vertically upwards and vertically downwards; - a second shaft, in which at least one upper distributor car and at least one lower distributor car are arranged one above the other and can be moved vertically upwards and vertically downwards separately from one another; wherein the elevator system is designed in such a way that the upper shuttle car and the upper distributor car each have a landing on an upper shuttle level and the lower shuttle car and the lower distributor car each have a landing on a lower shuttle level; wherein the second shaft comprises at least one first stop element (30, 32, 34, 36) adapted to at least temporarily limit a travel range of the upper distributor car to the upper shuttle level and a range vertically above the upper shuttle level; and wherein the second shaft comprises at least one second stop element (30, 32, 34, 36) which is arranged to limit, at least temporarily, a travel range of the lower distributor car to the lower shuttle level and a range vertically below the lower shuttle level, characterized in that the first stop element (30, 32, 34, 36) and the second stop element (30, 32, 34, 36) are designed to be movable, so that the first stop element (30, 32, 34, 36) and the second stop element (30, 32, 34, 36) can be moved between a release position, in which the travel range of the upper distributor car and the lower distributor car, respectively, is not limited by the respective stop element (30, 32, 34, 36), and a stop position in which the travel range of the upper distributor car or the lower distributor car is limited by the respective stop element (30, 32, 34, 36). - a first shaft, in which at least one upper shuttle car and at least one lower shuttle car are arranged one above the other and are at least temporarily fixedly coupled to one another and can be moved together vertically upwards and vertically downwards; - a second shaft, in which at least one upper distributor car and at least one lower distributor car are arranged one above the other and can be moved vertically upwards and vertically downwards separately from one another; wherein the elevator system is designed in such a way that the upper shuttle car and the upper distributor car each have a landing on an upper shuttle level and the lower shuttle car and the lower distributor car each have a landing on a lower shuttle level; wherein the second shaft comprises at least one first stop element (30, 32, 34, 36) adapted to at least temporarily limit a travel range of the upper distributor car to the upper shuttle level and a range vertically above the upper shuttle level; and wherein the second shaft comprises at least one second stop element (30, 32, 34, 36) which is arranged to limit, at least temporarily, a travel range of the lower distributor car to the lower shuttle level and a range vertically below the lower shuttle level, characterized in that the first stop element (30, 32, 34, 36) and the second stop element (30, 32, 34, 36) are designed to be movable, so that the first stop element (30, 32, 34, 36) and the second stop element (30, 32, 34, 36) can be moved between a release position, in which the travel range of the upper distributor car and the lower distributor car, respectively, is not limited by the respective stop element (30, 32, 34, 36), and a stop position in which the travel range of the upper distributor car or the lower distributor car is limited by the respective stop element (30, 32, 34, 36). wherein the elevator system is designed in such a way that the upper shuttle car and the upper distributor car each have a landing on an upper shuttle level and the lower shuttle car and the lower distributor car each have a landing on a lower shuttle level; wherein the second shaft comprises at least one first stop element (30, 32, 34, 36) adapted to at least temporarily limit a travel range of the upper distributor car to the upper shuttle level and a range vertically above the upper shuttle level; and wherein the second shaft comprises at least one second stop element (30, 32, 34, 36) which is arranged to limit, at least temporarily, a travel range of the lower distributor car to the lower shuttle level and a range vertically below the lower shuttle level, characterized in that the first stop element (30, 32, 34, 36) and the second stop element (30, 32, 34, 36) are designed to be movable, so that the first stop element (30, 32, 34, 36) and the second stop element (30, 32, 34, 36) can be moved between a release position, in which the travel range of the upper distributor car and the lower distributor car, respectively, is not limited by the respective stop element (30, 32, 34, 36), and a stop position in which the travel range of the upper distributor car or the lower distributor car is limited by the respective stop element (30, 32, 34, 36).