RPO on IC’s Hawkeye By Angela Cotey | September 20, 2018 | 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 A Railway Post Office clerk looks out from a doorway during a stop at Waterloo, Iowa, in April 1967. The train is Illinois Central’s Sioux City–Chicago Hawkeye. Philip R. Hastings photo