In which year did the train "City of San Francisco" come out of service?

The “City of San Francisco" was a streamlined passenger train which ran on the Overland Route between Chicago, Illinois and Oakland, California, with a ferry connection on to San Francisco. It was owned and operated jointly by the Chicago and North Western Railway (1936–55), Chicago, Milwaukee, St. Paul and Pacific Railroad (1955–71), the Union Pacific Railroad, and the Southern Pacific Railroad. It provided premium extra fare service from Chicago to San Francisco when introduced with a running time of 39 hours and 45 minutes each way. The “City of San Francisco” made its first run between Chicago and Oakland/San Francisco on 14 June 1936. In 1941, the frequency was increased to ten departures per month each way.

In 1960 the “City of San Francisco” was combined with the “City of Los Angeles” east of Ogden; a year later, the Southern Pacific's "San Francisco Overland" ended its long run as a separate San Francisco/Oakland to Ogden year-round daily train when that service was consolidated with the “City of San Francisco” except for occasional seasonal extra section runs. The "Overland" service ended in January1964.

In May 1971, Amtrak took over all long-distance intercity passenger operations in the United States. Amtrak retained the name “City of San Francisco” for the thrice-weekly Denver–San Francisco/Oakland portion of the run until June 1972, when the entire Chicago-San Francisco/Oakland route became daily again as the “San Francisco Zephyr.”