Hi Jeff,
Appreciate your thoughts. As well, I think MTH is generally still doing two road numbers, but my recent experiences are driving the question here.
Re: the MTH website, I mimicked your process (Advanced Find/2016v2/Premier/Rolling Stock) and found some but not all the 2016 v2 road numbers in the previews of 82 products. That matches my original thought where I said "many" of their newer pages seem to be missing the road numbers. Not all pages, but many. For 2016 v1, the same process brings up 85 products with zero road numbers listed. The Product Locator is one of the great tools in the hobby. I hope they update it.
Cheers,
Bryan
Captures from 2016 v2 query