Ma & Pa six-wheel switcher By Angela Cotey | April 17, 2015 | 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 Maryland & Pennsylvania 0-6-0 No. 30 stands at the road’s ramshackle coal dock at Baltimore in March 1955. H. N. Proctor photo Comments+ You must login to submit a comment