The H-16-66 was a road switcher built by Fairbanks-Morse between 1951 and 1958. Its designation stood for a power of 1,600 hp and six axles out of six powered. The power came from the eight-cylinder variant of FM's famous opposed piston diesel. The car body was available in four different variants. After the introduction of the H-24-66 “Train Master”, the H-16-66 was also called “Baby Train Master”.

Of 59 locomotives built, the highest number with 45 went to the Chicago & North Western. Today, two are preserved. One originally was No. 721001 of Alcoa (Aluminum Company of America). Today it resides at Nelson, British Columbia and carries the Tuscan and Grey livery of the Canadian Pacific that it actually never carried while in service. Another one is located at the Tennessee Valley Railroad Museum that once worked at Gallatin Power Plant, Tennessee.