Josh,
If you have not already done so, go to shaylocomotives.com and look up CN#3345. #7 was actually numbered 107. Later in ngdiscussion you will see entries on NM Lumber #7. Actually this Shay spent most of her useful life as OLC #107 and very little time in New Mexico. We hope someday to have her return to SVRR in Oregon where she can stretch out on our 5 miles of mainline (it maybe ~10 miles by the time she arrives). She belongs in Sumpter Valley.
Also look in Mal Ferrell's book "Rails Sagebrush and Pine" for photos of #107. The Sumpter Junction restaurant in Baker City has additional photos posted of OLC #107.
dan