Seashore Trolley Museum, located in Kennebunkport, Maine, United States, is the world's first and largest museum of mass transit vehicles. While the main focus of the collection is trolley cars, it also includes rapid transit trains, Interurban cars, trolley buses, and motor buses. The Seashore Trolley Museum is owned and operated by the New Engla…Seashore Trolley Museum, located in Kennebunkport, Maine, United States, is the world's first and largest museum of mass transit vehicles. While the main focus of the collection is trolley cars, it also includes rapid transit trains, Interurban cars, trolley buses, and motor buses. The Seashore Trolley Museum is owned and operated by the New England Electric Railway Historical Society. Of the museum's collection of more than 350 vehicles, ten trolley and railroad cars that historically operated in Maine were listed on the National Register of Historic Places in 1980 as Maine Trolley Cars.