Photographer Jack Delano recognized trains as an iconic feature of American cultural identity. Trains are central to American life; trains had long linked small communities to the outside world. This image conveys and celebrates the sheer mechanical power of these big machines. This one was traveling between Winslow and Seligman, Arizona, and stopped on a siding to cool its wheels after descending a mountain. The FT locomotives demonstrated that diesel electrics could withstand the rigors of main line service. They matched the performance of typical main line steam locomotives of the day, such as Mikado and Northern types. Operating costs were potentially less than those of typical steam locomotives. They could start a heavy train faster than the vast major of steam locomotives then in service. Selected with historical data by Betsy Fahlman, Arizona State University; technical description by Brian Solomon.