Casey Jr is the train seen in a film released by who?
Casey Jr. Splash 'n' Soak Station:  Casey Jr is the train seen in the film "Dumbo", where Dumbo, his mother, Mrs. Jumbo, and other circus animals travel on to the shows. Dumbo: Dumbo is a 1941 American animated film produced by Walt Disney Productions and released by RKO Radio Pictures.
RKO Radio Pictures