The tuning used by both bluegrassers and old-timeys is f#DF#AD. You can tune the 5th string to "a", but it loses something. I have seen some use aEAC#E to accommodate a fiddler.
A few more verses:
Reuben had a wreck and it broke old Reuben's neck,
But it never harmed a hair of my head.
Reuben had a wife, she was tired of her life,
'Cause Reuben didn't have no home.
Oh, Reuben, were you drunk when you pawned your watch and trunk
All for to get your baby out of jail?
Also, you can use any of the verses for "Train 45."