for storage, when I lived in an apartment for a few months I built a shelf system out of 1x2s.
a pair of vertical 1x2 with shelves of single 1x2 flat between, just wide enough for piece of 3' flextrack for rolling stock storage, spaced for the tallest piece (in my case hi-cube boxcars).
Eventually, the track and the 1x2 became part of the permanent layout, so nothing was wasted.
HO btw