Joe,
I think that is it, to fit your idea of what is left of the narrow gauge world for the earlier years. But there are some very exceptional recreations of NG logging lines, even using box cab Climax and tiny Shays. The list can be quite exciting if you include very private personal railroads of recent creation. I will not attempt to list them here as some are not wanting to even be exposed.
Post: There is a old 2' gauge line up in the Lake States I forgot to list, but it is now a Tourist Line.