I actually talked to someone at the Arts Council last year about adding more trolleys. If I recall correctly they said that the main issue was not being able to hire enough drivers.

And no, we have not been sent away disappointed -- the first year, a very kind volunteer whose name I never got gave us her tickets, and I would thank her again repeatedly if I knew who she was. The second year, we ran up to a trolley just as it was starting to leave, and they let us on because there were plenty of empty seats. So I'm not too worried that we'll manage to get on somehow. I just find it frustrating that the whole thing is such a "production."