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This is my own fantasy map on how to set up the network using the tunnel. Underground lines are hollow, thin lines are peak services.
It would not need the new surface line and instead keep the old exisiting line through the pedestrian zone, which will only be used by 18 trams/hour, which in my opinion is not a problem to have in a pedestrian zone. Also especially the long and highfloor tram-trains would run underground.
By doing so, the 3/4 loop can be kept. Only line 5 will lose their direct connection to the inner city and instead become a fully tangential line.
Other ideas are to split up and extend the ends of line 5 in order to relieve the S2 line and a new tangential line 7 to relieve the S1.
