Earlier there was about double what is in place now but it was a hoarders mess. Sidings were clogged, bays in the open ceiling rafters were over full, cases of stuff were under the layout and on Homer shelves in the garage.
Two years ago the stash was sold down so that now I have manageable sidings and 144' of full shelving. In the selling process I had found a couple of SS engines I had been looking to purchase not realizing they were already in house.
I do not swap off the trains stored on shelving to run. They are just considered wallpaper.
Those shelves are a pain on which to mount trains. No idea why they have that totally unnecessary center rail. Once they get put there they stay there.