NNG - Other Forums like NGDF?

This forum is one of the best places in the railroad community to learn and share info and pictures on narrow gauge subjects.

But for those who, like me, are interested in other railroad topics as well, there don't seem to be a lot of places to specifically discuss stuff like Civil War and Pre-CW railroading, or standard gauge steam-era shortlines, logging operations, etc. Unless of course you go to someplace like RYPN or Trainorders, but those are not exclusive to any given subject. Would love to know if there are more forums like this one, designed for the said topics above.