The Mainer version lyrics are:

The longest train I ever saw
Was the day I left my home
The engine had passed the 6-Mile Post
And the cab had never left town.

chorus:
Look up, look down, that lonesome road
Where you and I must go
To the pines, to the pines, where the sun never shines,
And I shiver when the cold winds blow.

The prettiest little girl I ever saw
Was walking down the line
Her cheeks was painted rosy red
And her hair hung down behind.

chorus

That train run back four miles from town
And killed my girl, you know
Her head was found in the driver wheel
Her body I never could find.

chorus

Bluebird B-6222 (mx 94340-1), recorded 6 August 1935 in Atlanta. (From an mp3 downloaded off the jazz-on-line.com site.)