The caption to the photo below, from Yenne, Bill, ed., All Aboard! The Golden Age of Rail Travel, reads in part: “In January 1952, a monstrous blizzard trapped passengers aboard the City of San Francisco for four days.” Somewhere in my collection I have a newspaper account published on the 50th anniversary of the incident and my recollection is that helicopters were used to drop supplies to the train, after it stopped snowing and helicopters could fly. Then the rails had to be cleared and the train dug out.