"Freight Train," simple as it seems, has a wonderful characteristic. That plunge into the minor, so warm and sad and deep.   You've brought it out well, Schweik.

I found a youtube video of Libba Cotten herself performing it. (Nigel and Dave: you can google her name and learning something about music.) She plays a fancy guitar acc. using only 1 (or maybe 2) right-hand fingers!