The original sheet music to Roff's "Great Rock Island Route!" (1882) is visible here:


https://levysheetmusic.mse.jhu.edu/collection/057/135

The "Wabash Cannonball" was an actual train of the period:

Chicago Tribune, Feb. 12, 1881: "The Wabash 'cannonball train' was three hours late [owing to a blizzard]."

St. Louis Daily Globe-Democrat (Feb. 18, 1882): "Charles Ogden...arrived yesterday morning on the Wabash Cannonball."

The latest mention I've found of the real train is from 1904.