Floyd Canada, a black Texan cowboy who was about four years older than A.P., was singing these lines by 1915:
"But give me my shoes, and press my overalls"
"... train they call the Cannonball"
"... it takes a worried woman to sing a worry song"
"I'm worried now, but I won't be worried long"
"The train I ride is sixteen coaches long"

("Notes on Folk-Lore of Texas" by W. Prescott Webb, _The Journal of American Folklore_ Jul.-Sep. 1915)