I found what I think was the last narrow gauge (3')swamp logger running on October 6, 1973 at Como, N.C.
It was owned by W. P. Morris and used a diesel critter and 3 log cars. The rear car was loaded with rail indicating its possible dismanting, or relocation. I do not know how much longer it was running. I wrote it up in a story in Light Iron Digest Volume 1, #4; A/Sept 1999. I do not know its length at that time as its rails ran under water and I was alone in snake country and without boots or gun.
There is no question that the Meadow River Lumber Co was a true logger. And it ran until May 25, 1971. Log cars were loaded with a loader that day (by Georgia-Pacific Co). Logs were draged to the loader by cats from nearby stumps. I photoed the last spur built to reach some logs in 1970 and photos are around showing the track crew building that track just for logs. The trains were run with 70-ton GE engines.
Although it is not a true logger, there is still a private railroad that runs from a sawmill to the main line connection (C&0) in Virginia. It is solely operated to move it product and no other traffic, for over 2 miles. It is a private lumber railroad of the rare kind. I will save the name and location for later.