Skipping my early collecting years that I lost in a divorce, in the 90's I purchased Williams Brass, then Weaver Brass with passenger sets then MTH.
I decided to buy all the MTH F3's up through the book issued in 2000. Add to that the diesels mostly in UP colors and a bunch of the Steam engines.
Then I got curious about Williams. I decided that 1984 was Williams' defining year. Everything had come together and he issued a complete catalogue. I decided to buy everything in that catalogue even the cheapie boxed sets. As everyone says, 'it is in the hun't. The F7 NH AA was a really hard item to land. (OK, I admit it was not issued in 1984 but the picture was in the catalogue) Personally I think the 1984 Williams Catalogue is as good or better than a Lionel Catalogue from 1969-1984. While Lionel was issuing the same old thing, Williams was breaking new ground.
Do my 2000+ cameras count?
