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The 1st generation tram systems used a mix of trolley poles and bow collectors - Blackpool ran with poles then switched to pantographs, two I know of that used bow collectors were Leeds and Glasgow. The problem is that the overhead usually needs to be set up for one system - pantographs don't need the "frogs" to guide trolley poles. Blackpool seem to have found a way around this by using metal bars to guide the pantographs under junctions (avoiding them becoming tangled in the frogs). They need to do this in order to be able to operate both their main pantograph-equipped fleet and their collection of classic trams with poles.
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