We're kind of getting into "chicken and egg" land here.
Would more folks get into S if there was more modern equipment or would more modern equipment get more folks into S?
The correct answer is: I dunno...
Modern seems to sell well in the other scales. Model Railroader magazine features articles from those that do the contemporary scene almost as much as the steam/early diesel folks. Much as I would like to see more stuff from the 50's and 60's, I realize that without contemporary models available, S will eventually wither away into obscurity. Again...
It was a big surprise to me when Lionel offered scale wheeled locomotives, even though they now seemed to have backed away somewhat from them. The bigger surprise was DCC compatibility.
I have to agree about dong the archeology for scale SD70 wheels. It takes quite a bit of digging to find the part number on Lionel's website and then you have to call them to order the wheels, not just fill out a web order. What a pain in the patootie...
Why not just give them a 6-xxxxx number and place them in the catalog? Preferably in a conspicuous place on the locomotive's page AND back with the accessories. If separate sale scale wheels are going to be the route Lionel chooses, why not allow us to order them when we order the locomotive from our favorite dealer?
And we're still not exactly sure which type of wheel will be included with the cylindrical hoppers. The 2012 catalog mentioned scale wheels and trucks, the 2013 catalog is silent about "features."
I know, I know... "Items depicted in this catalog are subject to change in price, color, size, design and availability. Verify features on product package."
I'd love to have a cylindrical hopper in my hot little hands right now so I could verify those features on the package.
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S Scale has always been a tough sale. Even when the scale was "booming"(not exactly the right word, but shall we say the polite word...) in the late 90's early 2000's, you could show off how wonderful the equipment ran, the decoration, the detail, the size advantage to the masses and folks would appear genuinely interested.
Then you'd get the musical question: "Where can I get it?"
That's where the "sales pitch" fall flat. You'd have to fumble around, maybe give them a handout (and an SHS catalog if available,) recommending web sites, Scenery Unlimited or some other small mail order house and your potential convert would slowly disappear into the crowd.
American Models was the reboot S Scale needed in the 1980's. That re-reboot will now fall on both Lionel and MTH.
Rusty