They started it last year I think. They have already done trips (or doing them now) to the Pacific NW, California and the SW, SE (local to them), and Midwest. Last I saw, they are doing the NE and east coast in 2023.
They have a pickup and RV trailer that they tow around, visiting various sites, museums, and model railroad clubs. They have a facebook page and a website to see progress, photos, announcements to meet and greet locations, and even to put suggestions.