I had the pleasure of visiting Zürich, Switzerland, in 2019.  I was so impressed with its transit system.  For a city with a relatively small population, Zürich had such a dense public transit network - it was frequent, punctual, (relatively) easy to navigate.  Here is my take on the network, which, as you can see, is not quite finished yet, but I'm about to embark on some other things in life and I may not get around to finishing off this diagram for some time yet, so I want to publish this draft so I can get some comments and feedback in the meantime.

I found this diagram an interesting challenge, because is the first time I have set myself to draw a diagram that includes each and every stop - including bus stops.  It makes for a far more granular, detailed map.  Definitely not quite elegant, and it doesn't have a visual "hook" that one can often create with simplier diagrams.  Nonetheless, I am quite happy with how this one turned out.