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Several European cities are reviving the tram as a low-carbon alternative to buses. Unlike diesel vehicles, modern trams run on —electricelectricalelectricityelectrified power drawn from overhead lines, producing no exhaust at street level. Because they —runranrunningruns on fixed rails, passengers can predict routes with confidence, and a single tram can —carrycarriedcarriescarrying the passenger load of several buses. Planners argue that this revival will —easeeasingeasedeasily congestion in city centres.