The Capitol Limited is a daily Amtrak train between Washington, D.C., and Chicago, running 764 miles (1,230 km) via Pittsburgh and Cleveland. Service began in 1981 and was named after the Baltimore and Ohio Railroad's Capitol Limited which ended in 1971 upon the formation of Amtrak. It carries the Amtrak train numbers 29 and 30, which were previously assigned to the discontinued National Limited.

The Capitol Limited was an American passenger train run by the Baltimore and Ohio Railroad, originally between New York City and Grand Central Station in Chicago, Illinois, via Union Station, Washington, D.C., Baltimore and Pittsburgh. For almost 48 years, it was the B&O's flagship passenger train, noted for personalized service and innovation. At the time of its discontinuation on May 1, 1971, when Amtrak took over most rail passenger service in the U.S., the Capitol Limited operated between Washington and Chicago.