of Denver, City of Kansas City, City of Los Angeles, City of Portland, and City of San Francisco. Amtrak, which took over most intercity passenger trains in the United States on May 1, 1971, kept a Chicago–Denver train but preferred the Burlington's route. The City of Denver made its last run on April 30, 1971. Route Between 1936–1955 the City of Denver used the Chicago and North Western Railway between Chicago and Omaha. After 1955 it used the Milwaukee Road. The train's Union Pacific route west of Omaha remained unchanged for the duration. The train followed the Overland Route from Omaha to Julesburg, where it diverged southwest for Denver. In March 1950 it made the following stops west of Omaha: Columbus, Grand Island, Kearney, and North Platte in Nebraska and Julesburg in Colorado. On the C&NW it made the following stops west of Chicago, all in Iowa: Cedar Rapids, Ames, Boone, and Council Bluffs. The westbound train departed Chicago's Chicago and North Western Terminal at 5:00 PM and arrived at Denver's Union Station at 8:30 AM the following morning. With the switch to the Milwaukee Road the train's Chicago terminus shifted to Union Station. In June 1960 the City of Denver stopped in Davis Junction (for Rockford) and Savanna in Illinois, Marion (for Cedar Rapids) and Perry in Iowa. West of Omaha the station stops were unchanged. The new routing forced new timing; the westbound City of Denver departed Chicago at 3:45 PM and arrived in Denver at 7:35 AM the following morning. Although the new route took 20 minutes longer, by an odd coincidence it was exactly the same length as the previous one, at . Equipment Pullman-Standard and the Electro-Motive Corporation collaborated on the M-10005 and M-10006 streamlined trainsets which served as the City of Denver's original equipment. They were soon joined by the spare locomotive set M-10003 and the three (two plus backup) were used to provide daily service until they were replaced in 1953. The former M-10004 car set was also used while either of the two primary sets were down for refurbishing. Each set originally contained a two-car power set, with each unit developing . The power sets were upgraded with a second booster in mid-1939. Behind the power car was a baggage car with auxiliary power, a baggage-tavern car (containing the famed "Frontier Shack"), two 50-seat coaches, a dining-cocktail lounge, three sleeping cars in