Actually, I believe our (LHS) last 'Big Trains' catalogue from Walthers was around 2004 or 2005.
Talking with our sales rep from W, the rather dynamic and/or ephemeral nature of the product lines/marketing/manufacturing strategies of the major players...Lionel, MTH, K-Line, et al...made the production of a printed catalogue almost impossible. I mean, considering the lead time to put a catalog such as theirs together annually, when everyone waits impatiently for the semi-annual release of the manufacturers own catalogs...showing a rather completely new line-up of products.....what's the point??? By the time the W annual catalog is published, much of the sumo's content is null-amd-void. And the order-by dates are looonnnggg past!
Also, the W catalog printing/publishing is financed by the manufacturers. (Can we all say 'Well, duh!') So, what would be the incentive for the Big Boys to seriously contribute to a second published compendium of products?? In the end, for instance, the sumo's product pictures (sic) were non-colored, black ink. How boring.
The relative market volume speaks for itself. The relative ebay auction figures above are fairly descriptive of this.
Of course, historically Walthers began their operation/catalogs back in the 1930's with O scale exclusively. Basically, there was no HO, N back then. Whereas we will probably never see another "Big Trains" catalog from W again, they do represent quite a few manufacturers' product lines serving the O market where other distributors have ignored. Keil Line, Grandt, Northwest Shortline, Precision Scale, Berkshire Valley, etc.. PLUS, they have exclusive U.S. distribution rights for LGB and Maerklin, among others, in the large scale segments.
I'm VERY pleased, BTW, with their decision to move their O-scale Cornerstone products to Atlas. It's a PERFECT match. Kudos to Walthers and Atlas for the move and future of those...and, hopefully, some new...products!
KD