You're close. It was Toy Train Operating Society bulletin. There were only photos but adequate details that someone with rrTrack could easily derive the track plan.
The episode also starred Arthur Godfrey.
If you have a long time friend who is a TTOS member you can ask them. If not, I do have the issue in question in the train room. I even know which shelf. Just have to sort it out as that was from the late 80's as I recall. And if you really want to build it (I always thought it was a cool layout) I have a VHS tape of the episode.
Regards,
Lou N