1941 Walt Disney Studio Dumbo Animation Model Sheet. This 11” x 14” Photostat model sheet titled “Dumbo/’Revised Casey Jones Jr.’” was made during the completion of the production for Dumbo. It displays the drawings for final design of the train engine which pulls the circus train. Model sheets were used to ensure consistency in drawing of characters from various angles and dimensions. The studio’s “Character Model Dep’t” stamp is reproduced on right, showing the original date of issue: “1-2-41” as well as the initial of Joe Grant, the head of the department.