The music heard at the end of the episode "Choo-Choo Charlie". Is from a TV commercial for Good&Plenty candy that ran in the late 1950's & 1960's. It was very popular. And you would be hard pressed to find a baby-boomer that couldn't sing along with the lyrics. And many that could sing the song without a reminder. In the ad, which was animated. A small boy with an engineers hat. Is in the cab of a train pulling a car with a little girl and dog riding in it. The girl is eating the candy. But the little boy is moving the box to make the choo-choo sound. Good and plenty was. And is a licorice candy. It comes in two different colors, pink and white; mixed together in the box. The colorful soft candy coating covers a soft black licorice center.