I would nominate Phil Klopp's layout at his home in Easton, PA, and the NJ HiRailers club layout, for the distinction of being regarded as The Standard.
One reason I chose them is because I have seen them in person, and they are outstanding, IMO, for different reasons: NJ HiRailers layout for its enormous size and having so much that is done so well; Phil Klopp's layout for it's beauty, modeling craftsmanship, whim and whimsy, great size, and for another unique reason I will share later.
By the way, in case you haven't noticed, I'm a merciless teaser. LOL.
Arnold