NC&StL F units By Angela Cotey | November 12, 2024 | 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 Nashville, Chattanooga & St. Louis considered its 52 F3 and F7 units (32 cabs, 20 boosters) to be dual service locomotives, although only the B units had steam generators. Linn H. Westcott photo
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