A lifting system for vertical adjustment of a transportation system structure consists of a foot that is fastened onto the transportation system structure and during manufacturing assembly of the transportation system structure points downwards, and a foot cradle. The foot is bounded on opposite sides by two foot surfaces that are arranged at a foot-surface angle to each other. The foot cradle has two complimentary supporting surfaces against which the foot surfaces rest. The supporting surfaces are vertically movable, allowing the foot and transportation system structure to be raised or lowered, and the vertical adjustment thereby takes place. A transportation system cradle has at least one such foot cradle, and together with the transportation system structure suggested, form an intermediate product that can be moved between assembly stations in an assembly plant.