
So my suggestion is to introduce a new challenge: Travel all stops of a public transport network of your choice in the shortest amount of time per approached stop. So the challenge is two-fold: Find the fastest network and travel it as quick as possible.
The current London record is 1105:03 minutes for 274 stops (not counting the starting point) -> 241.98 seconds per approached stop. The New York record is 1494:03 for 467 -> 191.96 seconds. New York wins.
We may have to define a minimum size – to avoid one line two stops “networksâ€