Central Station -LRB- lower level -RRB- -LRB- LOCATION@1 unten -RRB- , where NUMBER@1 and NUMBER@2 branch into two different lines and PERSON@1 -LRB- U3/U6 -RRB- also have four tracks .

The stations Hauptbahnhof -LRB- ORGANIZATION@1 -RRB- -LRB- U1/U2 -RRB- and PERSON@1 -LRB- U3/U6 -RRB- have four tracks .
