1950's Post Sugar Crisp Cereal Tins

[Anonymous]

Hello,
My dad and I collected a set of 25 Railroad Line tins out of Post Cereal boxes. We have wut i believe is a complete set of 25 tins? These tins are approx. 3" X 3" in size and depicts all the major railroads. Does anyone have any information on these, ; ie, year of production, how many in a set, where they only in Sugar Crisp boxes, and if they have any value? I found these in my dads attick, and they all appear to be in very nice condition. Just would like to find out more about these Railroad tins.
Thankyou,
Mike