Fairbanks Morse H-12-44 switch locomotive Southern Pacific 1487 -- which was formerly US Army 1847 -- is seen in service in scenic Niles Canyon, California between Niles and Sunol, on the rear end of an excursion train pulled by Southern Pacific 2472.

A lot of people love the sound of Fairbanks-Morse engines, an opposed-piston design known for use in diesel-powered submarines and other marine applications. There aren't too many FM locos still in operation.