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Advocates of hydrogen fuel-cell propulsion have a new target for their technology: trolleys. At the Fifth International Hydrail conference, held 11 and 12 June in Charlotte, N.C., engineers and transit planners concluded that streetcars are an ideal early application for hydrogen propulsion. Traditional trolley cars have drawn their power from catenaries, unsightly overhead electricity supply lines running along city streets. Hydrogen-powered streetcars would eliminate the wires, which otherwise might stand in the way of a streetcar comeback.