The City of San Francisco was a streamlined through passenger train which ran from 1936 to 1971 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 in 1936 with a running time of 39 hours and 45 minutes each way.

A streamliner is a vehicle incorporating streamlining in a shape providing reduced air resistance. The term is applied to high-speed railway trainsets of the 1930s to 1950s, and to their successor "bullet trains". Less commonly, the term is applied to fully faired upright and recumbent bicycles. As part of the Streamline Moderne trend, the term was applied to passenger cars, trucks, and other types of light-, medium-, or heavy-duty vehicles, but now vehicle streamlining is so prevalent that it is not an outstanding characteristic. In land speed racing, it is a term applied to the long, slender, custom built, high-speed vehicles with enclosed wheels.