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You may have read or seen this elswhere but the lodon authorities at the time did not allow overhead wires inside a particular area . The London trams had a thing called a (like a knife blade ) plough which collected the current and returned it through the rails( Earth) . Frinstance if a tram arrived from the east end of London at say somewhere like Walthamstow a changer man would attach the plough under the tram and pull down the trolley pole for the journey on into the centre. The reverse would apply on the return journey........... Regards Alan
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