I love lists. For years my layout was on the den floor for only the Holiday 2 or 3 months and lots of problems could not be fixed due to the wiring being under the board. I kept a list of items to be fixed. Then next year I knew what had to be repaired before the layout went down the next year.
I have been collecting and buying engines, rolling stock and accessories for years. I keep a list of what I buy, where and when bought, from whom and price and condition. As time goes by it gets harder to remember what came from where. This also helps decide if I have had good success and at what train show and when.
When building my layout, I kept a list of the modifications or improvements I wanted to make. Each fall I would add wiring, switches, track, ect. to make additions at that time or allow me to add things during the winter when the layout was down and have them operational. I also keep records when additions are made.
When reading OGR and CTT magazines I keep lists by categories to note articles or ads noting the description, run number, date and page number. This has saved me lots of time looking through all the issues for a item. This is more valuable to me than the indexes the magazines provide. (note I have CTT from issue 1 to 2011, and OGR from when it was O Scale Railroading run 46 of 1976 up).
Do any of you all find lists valuable too?
Charlie