Re: why there isn't a tram or bus number 1 in Zurich
Tram no 1 was replaced by bus 31 and the tracks were removed. It ran along Zürich Barracks (Kaserne), crossed Langstrasse and joined tram 8 at Feld-/Hohlstrasse to go on to Hardplatz.
While I was in primary school at Hohlstrasse in the 50s a spectacular accident happened. A no 1 car overshot the corner of Feld-/Hohlstrasse, left the tracks and fell on its side. I can't remember if anyone was hurt or killed. There should be some pictures in the archives of Tages-Anzeiger and other papers.