I have S, HO, and N trains and the track to run them on. In HO, I have a 16 x 16 loft over the garage which is pretty much filled with a permanent, highly detailed HO layout. If I recall correctly, it's like 5 scale miles of track.
I did have an N scale layout, but had to tear it down when we remodeled the house (needed the storage space).
Kathy's condition now precludes spending the hours needed for model railroading, either in the loft or in the shop (where the N scale layout once was). I'm trying to gently coerce her into letting me have a small N scale layout inside the house here. We'll see about THAT, eh?
The S scale set was manufactured by American Flyer in 1957, the year I was born. That set is packed away and will probably stay that way. I got everything working perfectly before I packed it away, though.
So now I'm into scale models and model rockets, because I can work on either right here in the house. (As a matter of fact, today would be a good day to slip over to Dorsey Park for another launch!)