The Proffitt Lyrics given above are the best ones I know. If you're asking for the chords, I'm not sure that you understand what the tune is about. in my opinion, it's a modal tune. If you play full triad chord(s) under the melody, it gives it away, makes it too obvious. The beauty of modal tunes-and especially reuben's train is that chord changes are implied. I think that if you strum a D or dmin behind that repetitive melody, you'll find yourself playing one boring tune. If you have to arrange it for two people (guitar player doesn't want to sit it out, etc...) make him/her learn the melody or come up with an interesting counter melody. Also, I play it in the following tuning: aDGAD and sometimes aDGAC. In the latter, I can do some Dock Boggs sounding hammer ons/pulloffs on the high D string.