 As a bonus, the travel time for Line 16 will be decreased by about 10 minutes, because the NSS enables it to avoid the detour from "Ubierring" to "Barbarossaplatz", only to return to the Rhine at the Central Station.It is also the final step in the separation of the high-floor and low-floor networks.The current expansion project under construction is a new North-South tunnel ("Nord-Süd-Stadtbahn", NSS).