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Some technical clarification required I feel.
A dodgem has a pole connector that collects off an overhead grid so it can move around freely.
The floor is conductive and provides the return path.
And did you know you could get dodgem boats? This is me and my Mum at Lowestoft circa 1972
I have no idea how the return path works here 
Very rare ride. Very rare picture.
Also a vintage fairground ride enthusiast
Here's me returning the chauffeuring favour recently
She's not looking a day older either Hope I'm still riding in Z3s at 83+ 
A tram collects off an overhead fixed line and uses one of 3 basic collectors. One of which is a pantagraph. Single or double arm. It's called a pantagraph because of its resemblance to a sketching device, e.g. a sketch master.
Which I think is where we came in?
That's it. Bonkers boring post of the day out the way early
