"Chattanooga Choo Choo" is a famous song from 1941, and there was a 1941 film called "Sun Valley Serenade" featuring the song. There was also a 1984 film "The Jewel of the Nile" but it did not feature the song "Chattanooga Choo Choo".
It's possible you're thinking of a different movie or show. Could you please provide more details about the film you're interested in?