Behind the scenes of Dumbo, Disney artists like Jimmy MacDonald recorded sounds using manual Foley techniques, performing various effects live to the animation using everyday objects and custom props. The unique, mechanical-sounding "all aboard" phrase from the Casey Jr. train was a pioneering use of an early device called the Sonovox, which modulated a whistle sound with a human voice actor's mouth movements. Credit: Disney | History In Pictures

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A behind-the-scenes look at Disney’s 1941 production shows how sound effects for Dumbo were created—especially the voice of Casey Jr., the talking train. Using glass scrapers, throat tubes, and early talk-box tech, sound artists brought characters to life with creativity and grit. The footage, taken from The Reluctant Dragon documentary, highlights the ingenious Foley work behind classic cartoons—long before digital sound existed. | History In Pictures