Tom...
First, what issue of Model Railroader are the photos above from?
Secondly, I recall seeing photos of Mack's trains....but as I recall they were running above commercial store displays...something like a men's wear store, or something. I remember the same article had photos of several of the engines in his massive collection.
Lastly, this sort of 'Whatever-happened-to.....?' inquiry has always intrigued me. There are so many great layouts of the past, great craftsmen of the hobby, iconic names who really changed the hobby for the better, the folks who challenged us to dream and build. One such layout...again from the pages of Model Railroader...was a fellow who had a beautiful layout, beautiful hand-crafted engines, many of the Norfolk & Western type,.....and it was all in OO scale!!!! Then there was another issue of that magazine that featured a layout in England that had some of the most beautiful, immaculate, sweeping track work I had ever seen....and have never seen rivaled since. I believe in was in O gauge, too. The track had been hand laid, bullhead rail mounted on 'chairs', .....absolutely flawless. The cover photo of that issue was worth a stare, the article photos jaw-dropping.
So what happened to these? .....and others?
As diligent as the hobby journals have been in digging out the history and stories of the major manufacturers...most notably Lionel and Gilbert...it would make wonderful press....IMHO....to give some closure to a few of those memorable layouts that graced the pages past. Lord knows, as rag-tag as the remnants of documentation/knowledge might be with each passing day, some photos and oral recall might be lost forever by now.
And, yet, when we talk about the aging demographics of the hobby, I'm reasonably certain that someone somewhere knows...but not for much longer...just enough about an iconic layout or two that to re-tell and bring closure would make great reading. Of course, not everyone with that sort of info has the initiative to write and assemble a story. That's where a simple letter to the professionals...."I have some photos, knowledge, stories about so-and-so's layout that once was published in XYZ magazine. Do you have an interest in seeing/hearing?"...might be appropriate.
Just a thought....
KD