4 ms·The S4 in Zürich is usually consistently 4-10 minutes late during evening rush hour.by cjslep 9y agoThe S4 in Zürich is usually consistently 4-10 minutes late during evening rush hour.tpolzer 9y agoS4 is part of SZU, who are vastly less reliable than the main Swiss train operator SBB. (Might have something to do with their exotic rolling stock...)bitL 9y agoZürich is the least-Swiss city though ;-)