I am sensitive to real or possible privacy wishes of many modelers. Jeff's beautiful craftsmanship has been shown many times in photos and videos posted to these forums. So has the A&O on occasion. I intentionally didn't mention by name a third layout in Northern Colorado (and potentially others) out of respect.
I was once an "unrepentant" lone wolf HO-scale modeler until my first visit to the A&O. David met with me 1:1 and set me up with a long coal drag powered by his Alco C430, with all the coupler slack run-in. When I heard the couplers stretch I was hooked, and subsequently my life changed for the "more" better.
Many readers might be surprised at the number of 2-rail layouts lurking out-of-sight within a short drive of their homes... (I don't have a secret list of them...)