The protests are organized by, among others, a grassroots initiative, "Leben in Stuttgart" (Life in Stuttgart), the local branch of the German Green Party and the environmental organisation Bund für Umwelt und Naturschutz Deutschland. They are suggesting a renovation of the current railway station, including creation of some new railways, but respecting the cultural heritage of the Hauptbahnhof terminus and the natural heritage of the adjacent "Schlossgarten" (Palace Park). The park (see Old Castle (Stuttgart) and New Castle (Stuttgart)) by Nikolaus Friedrich von Thouret, is part of a cherished green space that connects the inner city with the banks of the Neckar river. During the estimated construction time of at least 10 years, the project would cut off connections to other park areas of the city, known collectively as the "Green U" due to their U-shaped form.