Jerry, mine is 6 3/4” from the ceiling. It is as low as I could put it and get it above the door in a 7 1/2 foot high ceiling in the downstairs family room. This house is 50 years old, but you would think they would put just one more corse of blocks in the basement level.
I built it with the same method as all my layouts. Put in a sturdy shelf, then lay track. I didn’t think it through! LOL