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APTA Heritage Trolley Task Force Promotes the development of vintage and heritage trolley lines and modern streetcar systems.
http://www.heritagetrolley.org
Light Rail Transit Association (LRTA) News and information about better public transport through light rail and tramway systems.
http://www.lrta.org
Market Street Railway Nonprofit organization dedicated to the preservation and operation of historic street cars in San Francisco.
http://www.streetcar.org