Duluth, the second-largest city on Lake Superior’s shore, was an international seaport and industrial force when its streetcar system was established in the late 19th century.

But it was a system that faced challenges unique to Duluth, mostly due to the city’s physical attributes, including some of the highest hills in Minnesota and the city’s oblong shape.

Aaron Isaacs’ new book, “Twin Ports by Trolley,” takes readers on a tour of all of the routes of Duluth during the city’s streetcar era.

The book’s format was established by Isaacs’ 2007 book, Twin Cities by Trolley, about the streetcar era in Minneapolis-St. Paul. He wanted to do another comprehensive streetcar history while appealing to people interested in local history.

However, this book appeals to anyone interested in streetcars and early mass transit.

The physical remnants of this era are gone, but Isaacs got his hands on an impressive wealth of research materials rich in interesting details, stories and images.

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