State of Bavaria and Munich city council wants the first U9 station to be built at the Hauptbahnhof at the same time as reconstruction of Hauptbahnhof main building and construction of second S-Bahn trunk line. The new changes relocate U9 platforms from the west end of regional and long distance platforms to the middle of main Hauptbahnhof building below the ground. The relocation places U9 station directly above the second trunk line station in a cross arrangement. This improves the passenger flow between two current U-Bahn lines (U4/U5 and U1/U2/U7/U8), one current S-Bahn trunk line, and aboveground level.