Santa Fe E6 diesels at 21st Street By Angela Cotey | February 29, 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 Unit 13 leads an A-B set of Santa Fe E6 diesels across the diamonds at 21st Street, Chicago, on an outbound passenger train in the 1950s. Classic Trains coll.