PRR doodlebugs By Angela Cotey | December 21, 2016 | Last updated on August 8, 2025 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Three Pennsylvania Railroad self-propelled motor cars (“doodlebugs”) layover near Penn Station, Baltimore, in May 1955. The cars worked commuter runs on the old Northern Central to New Freedom, Pa. Classic Trains coll.