George,
I asked David if he had any info on the Ponchatoula wreck and he sent me the pages from the annual report from the railroad dealing with the collision.
I did not ask about the Greenville, Alabama wreck or the wreck between Atlanta and Chattanooga. He was very willing to help me out and I believe if you emailed him he would help you out. He seems to have a lot of information he hasn't posted.
By the way, the image of the $3 dollar Confederate note on his site from the N.O.J.& G.N.R.R. is from our collection. It's in a frame hanging over my desk.