I hate being a Google "suck-up" as much as the next guy, but a spreadsheet in Google Docs is a great idea.
Ha! It never occurred to me.
And yes, it means I can look at it on phone (even though it's an ancient Blackberry), so if I'm at a train show,
and wondering if I already own a car, I can check. (I just started creating one of these and then
seeing how it looked on my phone, if you hadn't already guessed that!).
Spreadsheets can be sorted by columns, searched, and even filtered (i.e. "Show me only my NP box cars")
Ed, you're a smart guy. I don't care what they say about you.