This morning, I chose the 6 Train route in New York, thinking that I would knock off the 6 Train badge as a cool-down from TdZ Stage 1.
The game started, and I immediately clicked Join Event, whereupon I was whisked away to London.
After the event, I clicked Return to New York, expecting to be on the 6 Train route. Instead, it appears I was put on the Park Perimeter Loop. I went all the way around to see, since, as far as I know, there is no way in-game to see what route you’re on.
I quit Zwift and restarted. New York 6 Train was the selected route, so I went ahead and rode it. The second time, it worked fine.