Is this "East Tulsa" or "East Thomas" which was the Frisco's yard in Birmingham, Al? The latter *may* have been ETH, but I have never seen definitive proof
Can't answer this one; let us know if you find out. Note that the list does include TY for Thomas Yard.
FRA GM&O
This is the symbol for the former GM&N Frascati car shops, Mobile, Alabama