Part of the mission of O Scale Central is to link the existing O Scale community together. For a long time, Yahoo Groups hosted O Scale discussion. When those groups were no longer held on Yahoo, many moved to Groups.io. For O Scale traction and interurban, please check out OScaleTraction in Groups.io at https://groups.io/g/OScaleTraction .
There is a lot going on at the Traction Model Railroading group on Facebook. I hope this forum takes off.