From 2nd and 3rd grademusic at Child's Street Elementary in Athens, GA, IIRC, the chorus went like this:

On the Dummy, on the Dummy Line,
Rise and shine! Whoo!Whoo! [train whistles]
Rise and shine and pay your fine,
When you're riding on the Dummy, on the Dummy, Dummy Line.

In between 3rd and 4th grade, they built Whitehead Road Elementary, and we had students from both Childs Street and Alps Road attending the new school. Some of them had taken a trip with the YMCA summer program (led by a man named Kelley) to Mexico. They came back with all sorts of loot like bull whips, knives, and bull horns that you could blow. So from then on, when you got to the "WHOO!WHOO!", they blew their bull horns, as well as the class making th noise vocally. Great fun!