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19th century solutions don't work for 21st century cities.
These trolleys worked great back when they only had to share the streets with pedestrians and the occasional horse-drawn carriage. In the cage-enabling cities we have today all you'd have is a shitty bus, stuck in traffic along with all the cars, and with the unique inability to overtake any hazards on its tracks.
Go fully or semi-separated LRT or go bust.