George Bertino is at the controls in the cab of his diesel freight locomotive ready to pull out of the AT&SF yard in Winslow, Arizona. Judging by the year of the photo, and the wear and tear in the cab, this is likely an EMD model FT locomotive.
Mr. Bertino is apparently a veteran of steam locomotives as evidenced by his dress in traditional overalls. Note the sleeve protectors, not usually necessary in this new environment.
This scene was captured by Jack Delano in March of 1943.