I've heard of people living on subways. Just pay once and you ride subways forever.
Never get off? What about all the things humans need to do like eat, hydrate, pee, poo, bathe, etc?
I think they get off the trains to do that but they never leave the subway system. Don't they have food stands down there?
Oh you're saying staying within the turnstiles. I've never been to NY or seen subways before so I really can't picture it.