The National Railroad Museum is a railroad museum located in Ashwaubenon, Wisconsin, in suburban Green Bay.The museum is one of the oldest institutions in the United States dedicated to preserving and interpreting the nation's railroad history. It was founded in 1956 by community volunteers in Green Bay. Throughout its history, patron contributions have continued to create one of the largest railroad preservation institutions in the United States.The National Railroad Museum has a large collection of rolling stock and spanning more than a century of railroading and a number of historic locomotives, including an Aerotrain, Union Pacific Big Boy No. 4017 (One of the world's largest steam locomotive types), and British Railways Class A4 No. 60008 Dwight D Eisenhower (ex-London & North Eastern Railway No. 4496 Golden Shuttle) and train used by the Supreme Allied Commander and his staff in the United Kingdom and continental Europe during World War II.In addition to the rolling stock, there is a museum building housing a wide variety of railroad artifacts, an archive, and photography gallery. There is also a standard gauge track around the perimeter of the grounds. There is also an 80ft high wooden observation tower with views of the river and Green Bay. The museum hosts an annual Day Out with Thomas event, where Thomas the Tank Engine pulls young friends past the exhibited rolling stock.