"Chattanooga Choo Choo" is a popular song written by Mack Gordon and Harry Warren in 1941. It became famous after being featured in the movie "Sun Valley Serenade." The song tells the story of a train journey to Chattanooga, Tennessee, capturing the excitement of travel and the romance of train rides. The song's catchy melody and upbeat rhythm contributed to its success, making it a big hit during the swing era. It has been covered by various artists over the years, solidifying its place in American music history as a classic representation of the Big Band sound.