Collecting Peco Wonderful Wagons (OO)

Hello, I'm Rob & I'm new, so go easy....

I've been building a collection of Peco Wonderful Wagons in OO Gauge over the years, I've got at least one example of just about every model ever made (apart from 2 of the approx 96 in the range that I know of).

The thing is, finding information of history of the models is quite a challenge, even Peco seem reluctant to share what they have (if indeed they have much). So I've taken to buying old Peco catalogues off eBay and I've started piecing together the history of the models, release dates and so on.

So what I'm looking to do is acquire any information out there on these little models, so I can build a detailed history. My plan ultimately is to produce a definitive history of the models to share with those who may be interested. Information may be personal knowledge, old catalogues, maybe even the two models I'm missing - I'd be happy to pay a reasonable amount for physical items.

Things I'm not sure about include when the various Series / Mks were released (this seems to roughly align with the decades) and what were the differences, when they went out of production, that sort of thing. Does anyone out there have any information or inkling to help?

There is honestly no information out there for these models - I thought it might be interesting to curate a little corner of modelling history. Anyone else interested?

Thanks in advance,

Rob T.

p.s. the models I am missing are R-62BF BR 3 Plank in Red Oxide (seems like it was only available around 1962 to 1965) and W-03 National Benzole tank wagon (it appears in a catalogue but not on a price list so I'm not sure it was ever released).