The transformation of the railway terminals in the new districts will take place in a way that mirrors the slow rhythms of change that the city undergoes. The railway sites are characterized as urban voids which are not immediately accessible; remediation and transformation of them will take years. It is therefore necessary to invent a strategy for envisaging the opening and uses for the new districts and at the same time conceive natural engineering techniques at the service of the city. A gradual substitution process is implemented. Progressively tree plantations replace old buildings and the last traces of railway services. The landscape long-term design of future district, is structured on the "artificial geography" of train network. In the case of the railway terminals Farini and Lambrate, the curvilinear rows of trees, follow the orientation of the old railway tracks and put into play the memory of the place. The rows of trees, planted at irregular intervals, function like a backdrop, creating a "landscape of backdrop". In keeping with the orientation of the railways tracks, this backdrop fluidly directs views and organizes paths, establishing the link of the future district with the history of the place. This peculiar planting system becomes the distinctive character of the site. The directionality of tree plantations and his arrangement in following backdrops, allow a prospective succession with different depths of field. The tree rows evoke those of the Lombardy countryside and follow the traces of water management. In the case of Porta Romana, the tree-lined backdrops has a clear orientation that, while carrying out the railway track directionality, keeps its linearity bringing out a more geometric composition.