Well, “TrainOps” actually started as operations software that I wrote a bunch of years ago. Then in 2010, I invited a bunch of LSC members to come up here for a weekend and help me finish my RR, and, in return, I fed them and then invited them back a couple months later to operate. That turned into the TrainOps weekend here at my place. Friday was “run what you brung” where people would bring their own trains over for photo runs. Saturday and Sunday were operation sessions. Then several years ago, Stan and I talked and we included his layout on Sunday, and Al joined to show off his RR on Friday. We’ve been doing it ever since (with a couple years off for COVID)
Crowds have been huge (especially when the weather is nice and we are included on the town garden tours), and small. But its great for me to have a hard deadline that the RR has to be in good shape for.
EDIT: Adding a link to the original build-a-rr thread Build-a-RR event