There is no service on the U1 (red line) from 07th July till 31st August between Schwedenplatz and Reumannplatz
Also the tram 67 will be discontinued in this time.
There are 2 extra trams serving the route of U1 and 67
goes Otto-Probst-Platz ,r Laxenburger Straße, Südbahnhof (Main train station) , Prinz-Eugen-Straße , Ringstraße to Schwedenplatz
Map of the new trams