In 1951---I was eleven years of age---I began to put together a collection of train tickets. Eventually I obtained several thousand of them. My father threw most of them away, but I did manage secretly to retain a small box of the most exceptional items.
At that date railway tickets all over the world conformed to the "Edmondson format"---thick cardboard, rectangular, 1+7⁄32 by 2+1⁄4 inches (31.0 by 57.2 mm), with a nominal thickness of 1⁄32 inch (0.79 mm). A wonderful series of pages may be found here
https://chriswhitetickets.yolasite.com/describing in detail the content of these tickets and their manufacture.
Also please see here:
https://en.wikipedia.org/wiki/Edmondson_railway_ticketOn the Internet there is plenty of information about coins and postage stamps, but not a tremendous lot so far about train tickets.
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