These are the lyrics to the song Dan mentioned. I had not heard it when I made the drawing, but I'm glad to know it now. Thanks Dan.
Old Hogan's Goat
Old Hogan's goat was feeling fine,
Ate six red shirts from off the line;
Old Hogan grabbed him by the back
And tied him to the railroad track.
Now when the train came into sight,
That goat grew pale and green with fright;
He heaved a sigh, as if in pain,
Coughed up those shirts and flagged the train!