This is all very helpful and thank you for all the responses. The Model 77 I showed does put out a pulsed DC wave. I used it frequently when running my 90's N scale, but those motors aren't quite the same as today's. They are mostly Kato built Atlas, post Kato Atlas, Rivarossi, and some Life Like.
It looks like perhaps I'll be using my Tech II and Tech IV MRC transformers for now.
My biggest frustration is tracking down all the parts. Down to missing track and turnouts, I only found two power supplies out of the probably dozen I own, and several engines somewhere in the depths of my storage unit. I'll likely tear that apart next weekend to pull the rest of the parts together and see where I'm lacking. I'm sure I'll also find many O scale treasures I forgot I had! Note to self, downsizing a home isn't always the best idea.
All my hobbies are in complete disarray as a result.
