Referendum in Leiden: the proposed route

This Wednesday the people of Leiden can vote whether they want a regional railway through their city.
This is the Breestraat (or Broad Street). On the right is the 17th century City Hall. The street is banned at most times for the private motor car, only busses, taxis and bicycles are allowed. The anti people say that this (and other) streets are to small to run a enormous tram through. The pro railway people say that the tram will make the Breestraat peaceful again, because the busses will go. They fail to mention however that the busses will only be diverted, and that they will be clogging up other busy streets in Leiden.
The main argument against is that the tram will run to places where you don't want to go.