The plans include new surface and underground lines connecting the station in Stuttgart’s enclosed central valley with existing lines. The Stuttgart–Wendlingen high-speed line running through a new tunnel, the Filder Tunnel, would connect the replacement Hauptbahnhof with a new Filder station ("Filderbahnhof"), serving the Airport, the "Messe" (trade fair) and the Filderstadt district. The line would then connect to the planned Wendlingen-Ulm high-speed line. The carriage sidings would be moved to the area of Untertürkheim station to clear land for redevelopment.