I made a trip over to my parents house and snagged a few boxes of HO scale model rail stuff she had under the house. My Father built me a layout when I was 10, it was up for a while then it got taken down when we moved.
I have no idea what the "value" of all this is if anything, but they mean so much to me. I see this stuff and think, "Wow...my Dad built a lot of this stuff. Bought a lot of it. Set it all up." I loved going through the boxes and remembering.
Sadly, some of the engines need a lot of work. They've been sitting in boxes for over 30 years! The trucks fell off when I lifted them out of the boxes. I might take them into a shop for repairs.
And...a lot of track. :)
The original plan was to build a shelf layout - maybe a switcher. However, I'm finding that I'm starting to fill in my office / layout room space. I'm not sure where it will go. So, I'm sitting with it all a while and we'll see what will happen in the future. I'm going to focus on cleaning things up and selling more of my random toy crap to make more room.