I recently came across an article on the early years of the Zürich streetcar. In the early 1900s, 5 minute schedules were customary, with one especially busy li

I recently came across an article on the early years of the Zürich streetcar. In the early 1900s, 5 minute schedules were customary, with one especially busy line running a 3 minute schedule! In contrast, nowadays the peak schedule is 7.5min.