That is strange.. I had seen, 2126 Train Cars many times as a kid in the LEGO catalogs in the mid-late 90's. I am in the U.S. which may be a contributing factor. I was the complete opposite on the 2150 Train/4554 Metro Stations though. I never knew of 4554, but that was a year or so before I got my first set and a few years before I started collecting and getting catalogs . Off topic, the yellow one was listed @ 600pcs for $72 USD, the red @ 599pcs for $73... go figure. I'm probably stating the obvious, but when it comes to "limited availability" seems, to me, like it's available though TLG only, or available only to country(s) X, a particular retailer, etc. I'm not exactly sure how they handled limited/exclusive set distribution that far back. Let alone availability for other countries. Set numbers, on the other hand, completely elude me... Some crazy algorithm I suppose