Under the hood of a hood unit By Faith Finfrock | December 27, 2020 | Last updated on February 25, 2021 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates The open hood doors on the left side of a Southern Pacific GP9 reveal the locomotive’s 567C diesel engine, main generator, and auxiliaries. Photo by EMD