Mark,
If you like operating trains, Don't rule out joining the NMRA.
After attending a large local train show, which is sponsored/run by the local division of the NMRA, I began asking questions about what exactly an operating session is. Because I kept asking questions, I was fortunate enough to have been invited to an operating session. Although it was in HO scale, the guys all share a love of trains in all scales. I continue to operate with them and is my greatest source for layout design, prototypical modeling, realistic operations, impressive scenery, trackwork , benchwork and more.
So, if you like operating trains, don't rule out joining the NMRA and spread the word that your interested in operating. I think you'll like what you find.
Good luck!