And those who ride GO trains.
While go is POP, sometimes it doesn't really feel like it. Even if you have ride tickets, you still need to punch them before getting on the train. It's not like local transit POP, where all you need to do is flash your card if asked.
And yes nfitz, a lot of people still don't really get the concept of POP on the Queen streetcar route. Even those who board after transferring from the subway, they do so through the front doors, because that's what they think they're supposed to do. The Queen streetcar isn't exactly the poster child for POP efficiency.