I don't understand why you can't put 0-72 curves on a 22x22 layout. I have STD-87 and 0-72 on 13x13. Now, my layout is a pretty simple "racetrack" affair, but with 22 feet there should be room for 72" curves and still have some complexity, yards, grades, etc. You will have to make compromises, but if you want the capability to run big stuff, 22 feet square is enough to do it. You seem to have chosen a more complex operational capability at the price of not running the largest locomotives. That's a legitimate choice, but if you want to run the big iron I would think there would be some way to add a loop of 0-72 somewhere - maybe another level? I chose simplicity and big curves, in part because I can run at a 50-foot club/museum layout and I wanted the ability to test run the big guys without hauling all the way across town to the museum.
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