They tend to get on at one station and then get off one or two stations later. And I've only ever seen them when it's busy. Thinking about it, I've never seen them in the city centre section, once on the Altrincham section (I don't really have a reason to go up there that often) and about ten times on the Bury section. I seem to recall there being one on every tram when I was little, but it might be my memory playing tricks on me, I would have been about 7 or 8 at the time.
Adam
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