 The "City of St. Louis" began operating on June 2, 1946 between St. Louis, Missouri and Cheyenne, Wyoming, where its cars were switched to other Union Pacific trains to continue west to the Pacific coast.In April 1951 it became a separate train from St. Louis to Los Angeles, California, skipping Cheyenne; it still carried some cars to switch to trains to other coast cities.In 1964 it was combined with the "City of Los Angeles" west of Ogden, Utah, and in 1968 with the "City of San Francisco" from Cheyenne to Ogden.