Blueprint Drawing of the 1897 Baldwin Steam Locomotive, "Engine No. 7," circa 1921

This 4-4-0 American-type locomotive pulled passenger trains on the Detroit & Lima Northern Railway, a predecessor of the Detroit, Toledo & Ironton Railroad. The 4-4-0, with four leading wheels, four driving wheels, and no trailing wheels, was a popular design on 19th-century U.S. railroads. Its small size and light weight were well suited to rough track.