On some sites, they have a place for more "general" types of discussions, that don't necessarily fit into any other forums. A lot of the threads Arnold starts, for example, are not just about "traditional toy trains", but since that's his focus, they are posted in that category. His latest, about "which trains bring you happiness", could (and do) apply to any and all types of modeling.
Perhaps a "crew lounge" category has a place here...?
Mark in Oregon