Timeworn T1 By Angela Cotey | November 21, 2024 | 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 Pennsylvania Railroad class T1 4-4-4-4 duplex 5536 shows the effects of hard service at Chicago in the late 1940s, but the engine is in fact less than five years old. Classic Trains coll.