B&O F7 helpers By Angela Cotey | November 2, 2022 | Last updated on August 7, 2025 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates A four-unit set of EMD F7 diesels leans against a coal drag climbing Baltimore & Ohio’s Cranberry Grade west of Terra Alta, W.Va., in the early 1950s. H. W. Pontin photo