Washington–Chicago Express

The Washington–Chicago Express, an American named passenger train of the Baltimore and Ohio Railroad (B&O), was one of four daily B&O trains operating between Washington, D.C., and Chicago, Illinois, via Pittsburgh, Pennsylvania, during the 1930s–1960s. Other B&O trains of that period on the route were the Capitol Limited, Columbian, and the Shenandoah.

Operating westbound as Train # 9, the Chicago Express, and eastbound as Train # 10, the Washington Express, it was an "accommodation" train, meaning that it made stops at most stations along the route bypassed by B&O's other trains, resulting in a slower timecard than the more prestigious Capitol Limited. The Washington–Chicago Express required a leisurely 18½ hours for its 767-mile (1,234 km) journey, compared to the faster Capitol Limited's 16-hour pace. The Washington–Chicago Express was also B&O's primary train for mail and Railway Express Agency shipments, having heavy head end equipment consisting of several Railway Post Office (RPO) cars, baggage cars, and bulk mail boxcars. The Washington–Chicago Express continued to offer Pullman sleeping car and dining car service into the mid-1960s.