Twin Ports by TrolleyAn international seaport and an industrial powerhouse, Duluth was a natural for streetcar service, but making it successful was a challenge. The city, some twenty five miles long yet only three miles wide in most places, has the tallest and steepest hills in Minnesota and a harbor separating it from its sister city, Superior, Wisconsin. Twin Ports by Trolley charts the history of the streetcar system that met the unique difficulties posed by Duluth,