Don't have the Tenneva Rambler's version, but Norm Cohen, in "The Long Steel Rail," that their title was "The Longest Train I Ever Saw." He also says that their recording was the first to have the 'six-o'clock-nine o'clock' couplet,
The engine passed at six o'clock,
And the cab it passed at nine.

Clause Grant, a member of the Ramblers, said he had written the above couplet in Macon, GA, while the band was in a car waiting at a crossing for a 150-car train. See liner notes to Puritan 2001. From "The Long...," p. 496, in discussion of "The Longest Train."

It may have been mentioned before, but the 'Black Girl' verse was first collected in 1917 by Sharp and Karpeles, from Lizzie Abner, KY.