Here's a link that may help with your question: http://oktrains.com/COGRS.html also for the Tulsa Area: http://www.tulsagardenrailroadclub.org/ I know there are many layouts in the Tulsa area, as well as at least 3 modular layouts that travel Oklahoma--1 from the COGRS, 1 from TGRRC, and my family here in Tulsa. Good luck with whatever happens.
Yeah, just under 3 hours. If brooks2128 happens to move to the area before June 6th, our Tulsa group is hosting a tour that we would love to have you come up. Or anyone that wouldn't mind the drive. From my understanding the COGRS has members spread out from the Lawton to North OKC area. Don't know all the particulars, but a good group of people.