Replaced by the extended line 89.
Line 304 will be discontinued.
The entire route from Altstetten station to Unterengstringen, Sennenbüel will now be served by line 89.
Line 89 will not depart from Altstetten Nord station, but rather from the other side of the station, on Hohlstrasse, in front of the Zahnarztzentrum (stop C).
