B&O “Dockside” 0-4-0T

Baltimore & Ohio No. 9 is one of four class C-16 0-4-0T switchers built in 1912 to work tight-radius street trackage along Baltimore harbor. Two were rebuilt as tender engines in the 1920s, but the other two worked as-built until several years after World War II. Their compact size made them a favorite among HO model railroaders in the 1950s.
B&O photo