Tickets must be purchased before boarding.

I saw something kind of funny on the train a couple days ago.

A police got on the train to check tickets, and it was a really full train. He made a big announcement, "Does everyone on here have a fare? There's no way I'm going to get all the way back there, so let's do this: If you don't have a fare, raise your hand and I'll come to you. Raise your hand if you don't have a fare."

He checked a dozen or so people that were right by the front, and then got off at the next stop.

A couple stops later he got back on our car again and went farther back. He said the same thing though, "Who does not have a ticket? Just raise your hand..."

It was amusing to pretty much everyone on the train. Usually they just say "Tickets?" and that's it.